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diffraction</title> <meta name="description" content="Search results for: neutron diffraction"> <meta name="keywords" content="neutron diffraction"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none 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action="https://publications.waset.org/abstracts/search"> <div id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="neutron diffraction"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 1461</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: neutron diffraction</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1461</span> Magnetic Structure and Transitions in 45% Mn Substituted HoFeO₃: A Neutron Diffraction Study</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Karthika%20Chandran">Karthika Chandran</a>, <a href="https://publications.waset.org/abstracts/search?q=Pulkit%20Prakash"> Pulkit Prakash</a>, <a href="https://publications.waset.org/abstracts/search?q=Amitabh%20Das"> Amitabh Das</a>, <a href="https://publications.waset.org/abstracts/search?q=Santhosh%20P.%20N."> Santhosh P. N.</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Rare earth orthoferrites (RFeO₃) exhibit interesting and useful magnetic properties like multiferroicity, magnetodielectric coupling, spin reorientation (SR) and exchange bias. B site doped RFeO₃ are attracting attention due to the complex and tuneable magnetic transitions. In this work, 45% Mn-doped HoFeO₃ polycrystalline sample (HoFe₀.₅₅Mn₀.₄₅O₃) was synthesized by a solid-state reaction method. The magnetic structure and transitions were studied by magnetization measurements and neutron powder diffraction methods. The neutron diffraction patterns were taken at 13 different temperatures from 7°K to 300°K (7°K and 25°K to 300°K in 25°K intervals). The Rietveld refinement was carried out by using a FULLPROF suite. The magnetic space groups and the irreducible representations were obtained by SARAh module. The room temperature neutron diffraction refinement results indicate that the sample crystallizes in an orthorhombic perovskite structure with Pnma space group with lattice parameters a = 5.6626(3) Ǻ, b = 7.5241(3) Ǻ and c = 5.2704(2) Ǻ. The temperature dependent magnetization (M-T) studies indicate the presence of two magnetic transitions in the system ( TN Fe/Mn~330°K and TSR Fe/Mn ~290°K). The inverse susceptibility vs. temperature curve shows a linear behavior above 330°K. The Curie-Weiss fit in this region gives negative Curie constant (-34.9°K) indicating the antiferromagnetic nature of the transition. The neutron diffraction refinement results indicate the presence of mixed magnetic phases Γ₄(AₓFᵧG <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutron%20powder%20diffraction" title="neutron powder diffraction">neutron powder diffraction</a>, <a href="https://publications.waset.org/abstracts/search?q=rare%20earth%20orthoferrites" title=" rare earth orthoferrites"> rare earth orthoferrites</a>, <a href="https://publications.waset.org/abstracts/search?q=Rietveld%20analysis" title=" Rietveld analysis"> Rietveld analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=spin%20reorientation" title=" spin reorientation"> spin reorientation</a> </p> <a href="https://publications.waset.org/abstracts/105883/magnetic-structure-and-transitions-in-45-mn-substituted-hofeo3-a-neutron-diffraction-study" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/105883.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">148</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1460</span> Deformation Mechanisms of Mg-Based Composite Studied by Neutron Diffraction and Acoustic Emission</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=G.%20Farkas">G. Farkas</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20Mathis"> K. Mathis</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20Pilch"> J. Pilch</a>, <a href="https://publications.waset.org/abstracts/search?q=P.%20Minarik"> P. Minarik</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Deformation mechanisms in an Mg-Al-Ca alloy reinforced with short alumina fibres were studied by acoustic emission and in-situ neutron diffraction method. The fibres plane orientation with respect to the loading axis was found to be a key parameter, which influences the acting deformation processes, such as twinning or dislocation slip. In-situ neutron diffraction tests were measured at different temperatures from room temperature (RT) to 200°C. The measurement shows the lattice strain changes in the matrix and also in the reinforcement phase depending on macroscopic compressive deformation and stress. In case of parallel fibre plane orientation, the increment of compressive lattice strain is lower in the matrix and higher in the fibres in comparison to perpendicular fibre orientation. Furthermore, acoustic emission results indicate a larger twinning activity and more frequent fibre cracking in sample with perpendicular fibre plane orientation. Both types of mechanisms are more dominant at elevated temperatures. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutron%20diffraction" title="neutron diffraction">neutron diffraction</a>, <a href="https://publications.waset.org/abstracts/search?q=acoustic%20emission" title=" acoustic emission"> acoustic emission</a>, <a href="https://publications.waset.org/abstracts/search?q=magnesium%20based%20composite" title=" magnesium based composite"> magnesium based composite</a>, <a href="https://publications.waset.org/abstracts/search?q=deformation%20mechanisms" title=" deformation mechanisms "> deformation mechanisms </a> </p> <a href="https://publications.waset.org/abstracts/99176/deformation-mechanisms-of-mg-based-composite-studied-by-neutron-diffraction-and-acoustic-emission" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/99176.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">162</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1459</span> X-Ray Diffraction and Precision Dilatometer Study of Neutron-Irradiated Nuclear Graphite Recovery Process up to 1673K</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yuhao%20Jin">Yuhao Jin</a>, <a href="https://publications.waset.org/abstracts/search?q=Zhou%20Zhou"> Zhou Zhou</a>, <a href="https://publications.waset.org/abstracts/search?q=Katsumi%20Yoshida"> Katsumi Yoshida</a>, <a href="https://publications.waset.org/abstracts/search?q=Zhengcao%20Li"> Zhengcao Li</a>, <a href="https://publications.waset.org/abstracts/search?q=Tadashi%20Maruyama"> Tadashi Maruyama</a>, <a href="https://publications.waset.org/abstracts/search?q=Toyohiko%20Yano"> Toyohiko Yano</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Four kinds of nuclear graphite, IG-110U, ETP-10, CX-2002U and IG-430U were neutron-irradiated at different fluences and temperatures, ranged from 1.38 x 1024 to 7.4 x 1025 n/m2 (E > 1.0 MeV) at 473K, 573K and 673K. To take into account the disorder in the microstructure, such as stacking faults and anisotropic coherent lengths, the X-ray diffraction patterns were interpreted using a comprehensive structural model and a refinement program CARBONXS. The deduced structural parameters show the changes of lattice parameters, coherent lengths along the c-axis and the basal plane, and the degree of turbostratic disorder as a function of the irradiation dose. Our results reveal neutron irradiation effects on the microstructure and macroscopic dimension, which are consistent with previous work. The methodology used in this work enables the quantification of the damage on the microstructure of nuclear graphite induced by neutron irradiation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nuclear%20graphite" title="nuclear graphite">nuclear graphite</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20irradiation" title=" neutron irradiation"> neutron irradiation</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal%20annealing" title=" thermal annealing"> thermal annealing</a>, <a href="https://publications.waset.org/abstracts/search?q=recovery%20behavior" title=" recovery behavior"> recovery behavior</a>, <a href="https://publications.waset.org/abstracts/search?q=dimensional%20change" title=" dimensional change"> dimensional change</a>, <a href="https://publications.waset.org/abstracts/search?q=CARBONX" title=" CARBONX"> CARBONX</a>, <a href="https://publications.waset.org/abstracts/search?q=XRD%20analysis" title=" XRD analysis"> XRD analysis</a> </p> <a href="https://publications.waset.org/abstracts/72835/x-ray-diffraction-and-precision-dilatometer-study-of-neutron-irradiated-nuclear-graphite-recovery-process-up-to-1673k" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/72835.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">401</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1458</span> Optimization of Highly Oriented Pyrolytic Graphite Crystals for Neutron Optics</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hao%20Qu">Hao Qu</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiang%20Liu"> Xiang Liu</a>, <a href="https://publications.waset.org/abstracts/search?q=Michael%20Crosby"> Michael Crosby</a>, <a href="https://publications.waset.org/abstracts/search?q=Brian%20Kozak"> Brian Kozak</a>, <a href="https://publications.waset.org/abstracts/search?q=Andreas%20K.%20Freund"> Andreas K. Freund</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The outstanding performance of highly oriented pyrolytic graphite (HOPG) as an optical element for neutron beam conditioning is unequaled by any other crystalline material in the applications of monochromator, analyzer, and filter. This superiority stems from the favorable nuclear properties of carbon (small absorption and incoherent scattering cross-sections, big coherent scattering length) and the specific crystalline structure (small thermal diffuse scattering cross-section, layered crystal structure). The real crystal defect structure revealed by imaging techniques is correlated with the parameters used in the mosaic model (mosaic spread, mosaic block size, uniformity). The diffraction properties (rocking curve width as determined by both the intrinsic mosaic spread and the diffraction process, peak and integrated reflectivity, filter transmission) as a function of neutron wavelength or energy can be predicted with high accuracy and reliability by diffraction theory using empirical primary extinction coefficients extracted from a great amount of existing experimental data. The results of these calculations are given as graphs and tables permitting to optimize HOPG characteristics (mosaic spread, thickness, curvature) for any given experimental situation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutron%20optics" title="neutron optics">neutron optics</a>, <a href="https://publications.waset.org/abstracts/search?q=pyrolytic%20graphite" title=" pyrolytic graphite"> pyrolytic graphite</a>, <a href="https://publications.waset.org/abstracts/search?q=mosaic%20spread" title=" mosaic spread"> mosaic spread</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20scattering" title=" neutron scattering"> neutron scattering</a>, <a href="https://publications.waset.org/abstracts/search?q=monochromator" title=" monochromator"> monochromator</a>, <a href="https://publications.waset.org/abstracts/search?q=analyzer" title=" analyzer"> analyzer</a> </p> <a href="https://publications.waset.org/abstracts/131609/optimization-of-highly-oriented-pyrolytic-graphite-crystals-for-neutron-optics" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/131609.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">142</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1457</span> Ground State Properties of Neutron Magic Isotones</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=G.%20Saxena">G. Saxena</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Kaushik"> M. Kaushik</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In the present investigation, we have employed RMF+BCS (relativistic mean-field plus BCS) approach to carry out a systematic study for the ground state properties of the entire chains of even-even neutron magic nuclei represented by isotones of traditional neutron magic numbers N = 8, 20, 40, 50, 82, and 126. The main body of the results of our calculations includes the binding energy, deformation, two proton separation energies, rms radii of the proton and neutron distributions as well as the proton and neutron density profiles etc. Several of these results have been given in the form of a series of graphs for a ready reference. In addition, the possible locations of the proton and neutron drip-lines as well as the (Z,N) values for the shell closures as suggested by the detailed analyzes of the single particle spectra, and the two proton and two-neutron separation energies for the different isotonic chains are also discussed in detail. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=relativistic%20mean%20field%20theory" title="relativistic mean field theory">relativistic mean field theory</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20magic%20nuclei" title=" neutron magic nuclei"> neutron magic nuclei</a>, <a href="https://publications.waset.org/abstracts/search?q=shell%20closure" title=" shell closure"> shell closure</a>, <a href="https://publications.waset.org/abstracts/search?q=separation%20energy" title=" separation energy"> separation energy</a>, <a href="https://publications.waset.org/abstracts/search?q=deformation" title=" deformation"> deformation</a> </p> <a href="https://publications.waset.org/abstracts/13497/ground-state-properties-of-neutron-magic-isotones" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13497.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">404</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1456</span> Fusion Neutron Generator Dosimetry and Applications for Medical, Security, and Industry</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kaouther%20Bergaui">Kaouther Bergaui</a>, <a href="https://publications.waset.org/abstracts/search?q=Nafaa%20Reguigui"> Nafaa Reguigui</a>, <a href="https://publications.waset.org/abstracts/search?q=Charles%20Gary"> Charles Gary</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Characterization and the applications of deuterium-deuterium (DD) neutron generator developed by Adelphie technology and acquired by the National Centre of Nuclear Science and Technology (NCNST) were presented in this work. We study the performance of the neutron generator in terms of neutron yield, production efficiency, and the ionic current as a function of the acceleration voltage at various RF powers. We provide the design and optimization of the PGNAA chamber and thus give insight into the capabilities of the planned PGNAA facility. Additional non-destructive techniques were studied employing the DD neutron generator, such as PGNAA and neutron radiography: The PGNAA is used for determining the concentration of 10B in Si and SiO2 matrices by using a germanium detector HPGe and the results obtained are compared with PGNAA system using a Sodium Iodide detector (NaI (Tl)); Neutron radiography facility was tested and simulated, using a camera device CCD and simulated by the Monte Carlo code; and the explosive detection system (EDS) also simulated using the Monte Carlo code. The study allows us to show that the new models of DD neutron generators are feasible and that superior-quality neutron beams could be produced and used for various applications. The feasibility of Boron neutron capture therapy (BNCT) for cancer treatment using a neutron generator was assessed by optimizing Beam Shaping Assembly (BSA) on a phantom using Monte-Carlo (MCNP6) simulations. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutron%20generator%20deuterium-deuterium" title="neutron generator deuterium-deuterium">neutron generator deuterium-deuterium</a>, <a href="https://publications.waset.org/abstracts/search?q=Monte%20Carlo%20method" title=" Monte Carlo method"> Monte Carlo method</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation" title=" radiation"> radiation</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20flux" title=" neutron flux"> neutron flux</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20activation%20analysis" title=" neutron activation analysis"> neutron activation analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=born" title=" born"> born</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20radiography" title=" neutron radiography"> neutron radiography</a>, <a href="https://publications.waset.org/abstracts/search?q=explosive%20detection" title=" explosive detection"> explosive detection</a>, <a href="https://publications.waset.org/abstracts/search?q=BNCT" title=" BNCT"> BNCT</a> </p> <a href="https://publications.waset.org/abstracts/160335/fusion-neutron-generator-dosimetry-and-applications-for-medical-security-and-industry" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/160335.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">194</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1455</span> Measurement of the Neutron Spectrum of 241AmLi and 241AmF Sources Using the Bonner Sphere Spectrometers</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Victor%20Rocha%20Carvalho">Victor Rocha Carvalho</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The Bonner Sphere Spectrometry was used to obtain the average energy, the fluence rate, and radioprotection quantities such as the personal and ambient dose equivalent of the ²⁴¹AmLi and ²⁴¹AmF isotopic neutron sources used in the Neutron Metrology Laboratory - LN. The counts of the sources were performed with six different spherical moderators around the detector. Through this, the neutron spectrum was obtained by means of the software named NeuraLN, developed by the LN, that uses the neural networks technique. The 241AmLi achieved a result close to the literature, and 241AmF, which contains few published references, acquired a result with a slight variation from the literature. Therefore, besides fulfilling its objective, the work raises questions about a possible standard of the ²⁴¹AmLi and about the lack of work with the ²⁴¹AmF. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nuclear%20physics" title="nuclear physics">nuclear physics</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20metrology" title=" neutron metrology"> neutron metrology</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20spectrometry" title=" neutron spectrometry"> neutron spectrometry</a>, <a href="https://publications.waset.org/abstracts/search?q=bonner%20sphere%20spectrometers" title=" bonner sphere spectrometers"> bonner sphere spectrometers</a> </p> <a href="https://publications.waset.org/abstracts/160581/measurement-of-the-neutron-spectrum-of-241amli-and-241amf-sources-using-the-bonner-sphere-spectrometers" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/160581.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">102</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1454</span> Neutron Contamination in 18 MV Medical Linear Accelerator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Onur%20Karaman">Onur Karaman</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Gunes%20Tanir"> A. Gunes Tanir</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Photon radiation therapy used to treat cancer is one of the most important methods. However, photon beam collimator materials in Linear Accelerator (LINAC) head generally contains heavy elements is used and the interaction of bremsstrahlung photon with such heavy nuclei, the neutron can be produced inside the treatment rooms. In radiation therapy, neutron contamination contributes to the risk of secondary malignancies in patients, also physicians working in this field. Since the neutron is more dangerous than photon, it is important to determine neutron dose during radiotherapy treatment. In this study, it is aimed to analyze the effect of field size, distance from axis and depth on the amount of in-field and out-field neutron contamination for ElektaVmat accelerator with 18 MV nominal energy. The photon spectra at the distance of 75, 150, 225, 300 cm from target and on the isocenter of beam were scored for 5x5, 10x10, 20x20, 30x30 and 40x40 cm2 fields. Results demonstrated that the neutron spectra and dose are dependent on field size and distances. Beyond 225 cm of isocenter, the dependence of the neutron dose on field size is minimal. As a result, it is concluded that as the open field increases, neutron dose determined decreases. It is important to remember that when treating with high energy photons, the dose from contamination neutrons must be considered as it is much greater than the photon dose. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=radiotherapy" title="radiotherapy">radiotherapy</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20contamination" title=" neutron contamination"> neutron contamination</a>, <a href="https://publications.waset.org/abstracts/search?q=linear%20accelerators" title=" linear accelerators"> linear accelerators</a>, <a href="https://publications.waset.org/abstracts/search?q=photon" title=" photon"> photon</a> </p> <a href="https://publications.waset.org/abstracts/70366/neutron-contamination-in-18-mv-medical-linear-accelerator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/70366.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">348</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1453</span> Effect of Cladding Direction on Residual Stress Distribution in Laser Cladded Rails</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Taposh%20Roy">Taposh Roy</a>, <a href="https://publications.waset.org/abstracts/search?q=Anna%20Paradowska"> Anna Paradowska</a>, <a href="https://publications.waset.org/abstracts/search?q=Ralph%20Abrahams"> Ralph Abrahams</a>, <a href="https://publications.waset.org/abstracts/search?q=Quan%20Lai"> Quan Lai</a>, <a href="https://publications.waset.org/abstracts/search?q=Michael%20Law"> Michael Law</a>, <a href="https://publications.waset.org/abstracts/search?q=Peter%20Mutton"> Peter Mutton</a>, <a href="https://publications.waset.org/abstracts/search?q=Mehdi%20Soodi"> Mehdi Soodi</a>, <a href="https://publications.waset.org/abstracts/search?q=Wenyi%20Yan"> Wenyi Yan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this investigation, a laser cladding process with a powder feeding was used to deposit stainless steel 410L (high strength, excellent resistance to abrasion and corrosion, and great laser compatibility) onto railhead (higher strength, heat treated hypereutectoid rail grade manufactured in accordance with the requirements of European standard EN 13674 Part 1 for R400HT grade), to investigate the development and controllability of process-induced residual stress in the cladding, heat-affected zone (HAZ) and substrate and to analyse their correlation with hardness profile during two different laser cladding directions (across and along the track). Residual stresses were analysed by neutron diffraction at OPAL reactor, ANSTO. Neutron diffraction was carried out on the samples in longitudinal (parallel to the rail), transverse (perpendicular to the rail) and normal (through thickness) directions with high spatial resolution through the thickness. Due to the thick rail and thin cladding, 4 mm thick reference samples were prepared from every specimen by Electric Discharge Machining (EDM). Metallography across the laser claded sample revealed four distinct zones: The clad zone, the dilution zone, HAZ and the substrate. Compressive residual stresses were found in the clad zone and tensile residual stress in the dilution zone and HAZ. Laser cladding in longitudinally cladding induced higher tensile stress in the HAZ, whereas transversely cladding rail showed lower tensile behavior. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=laser%20cladding" title="laser cladding">laser cladding</a>, <a href="https://publications.waset.org/abstracts/search?q=residual%20stress" title=" residual stress"> residual stress</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20diffraction" title=" neutron diffraction"> neutron diffraction</a>, <a href="https://publications.waset.org/abstracts/search?q=HAZ" title=" HAZ"> HAZ</a> </p> <a href="https://publications.waset.org/abstracts/75838/effect-of-cladding-direction-on-residual-stress-distribution-in-laser-cladded-rails" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/75838.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">273</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1452</span> The Application of the Analytic Basis Function Expansion Triangular-z Nodal Method for Neutron Diffusion Calculation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kunpeng%20Wang">Kunpeng Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=Hongchun"> Hongchun</a>, <a href="https://publications.waset.org/abstracts/search?q=Wu"> Wu</a>, <a href="https://publications.waset.org/abstracts/search?q=Liangzhi%20Cao"> Liangzhi Cao</a>, <a href="https://publications.waset.org/abstracts/search?q=Chuanqi%20Zhao"> Chuanqi Zhao</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The distributions of homogeneous neutron flux within a node were expanded into a set of analytic basis functions which satisfy the diffusion equation at any point in a triangular-z node for each energy group, and nodes were coupled with each other with both the zero- and first-order partial neutron current moments across all the interfaces of the triangular prism at the same time. Based this method, a code TABFEN has been developed and applied to solve the neutron diffusion equation in a complicated geometry. In addition, after a series of numerical derivation, one can get the neutron adjoint diffusion equations in matrix form which is the same with the neutron diffusion equation; therefore, it can be solved by TABFEN, and the low-high scan strategy is adopted to improve the efficiency. Four benchmark problems are tested by this method to verify its feasibility, the results show good agreement with the references which demonstrates the efficiency and feasibility of this method. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=analytic%20basis%20function%20expansion%20method" title="analytic basis function expansion method">analytic basis function expansion method</a>, <a href="https://publications.waset.org/abstracts/search?q=arbitrary%20triangular-z%20node" title=" arbitrary triangular-z node"> arbitrary triangular-z node</a>, <a href="https://publications.waset.org/abstracts/search?q=adjoint%20neutron%20flux" title=" adjoint neutron flux"> adjoint neutron flux</a>, <a href="https://publications.waset.org/abstracts/search?q=complicated%20geometry" title=" complicated geometry"> complicated geometry</a> </p> <a href="https://publications.waset.org/abstracts/63283/the-application-of-the-analytic-basis-function-expansion-triangular-z-nodal-method-for-neutron-diffusion-calculation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/63283.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">445</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1451</span> Thermodynamic Trends in Co-Based Alloys via Inelastic Neutron Scattering</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Paul%20Stonaha">Paul Stonaha</a>, <a href="https://publications.waset.org/abstracts/search?q=Mariia%20Romashchenko"> Mariia Romashchenko</a>, <a href="https://publications.waset.org/abstracts/search?q=Xaio%20Xu"> Xaio Xu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Magnetic shape memory alloys (MSMAs) are promising technological materials for a range of fields, from biomaterials to energy harvesting. We have performed inelastic neutron scattering on two powder samples of cobalt-based high-entropy MSMAs across a range of temperatures in an effort to compare calculations of thermodynamic properties (entropy, specific heat, etc.) to the measured ones. The measurements were correct for multiphonon scattering and multiple scattering contributions. We present herein the neutron-weighted vibrational density of states. Future work will utilize DFT calculations of the disordered lattice to correct for the neutron weighting and retrieve the true thermodynamical properties. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutron%20scattering" title="neutron scattering">neutron scattering</a>, <a href="https://publications.waset.org/abstracts/search?q=vibrational%20dynamics" title=" vibrational dynamics"> vibrational dynamics</a>, <a href="https://publications.waset.org/abstracts/search?q=computational%20physics" title=" computational physics"> computational physics</a>, <a href="https://publications.waset.org/abstracts/search?q=material%20science" title=" material science"> material science</a> </p> <a href="https://publications.waset.org/abstracts/189169/thermodynamic-trends-in-co-based-alloys-via-inelastic-neutron-scattering" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/189169.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">32</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1450</span> Mechanism of Dual Ferroic Properties Formation in Substituted M-Type Hexaferrites</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20V.%20Trukhanov">A. V. Trukhanov</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20V.%20Trukhanov"> S. V. Trukhanov</a>, <a href="https://publications.waset.org/abstracts/search?q=L.%20V.%20Panina"> L. V. Panina</a>, <a href="https://publications.waset.org/abstracts/search?q=V.%20G.%20Kostishin"> V. G. Kostishin</a>, <a href="https://publications.waset.org/abstracts/search?q=V.%20A.%20Turchenko"> V. A. Turchenko</a> </p> <p class="card-text"><strong>Abstract:</strong></p> It has been shown that BaFe<sub>12</sub>O<sub>19</sub> is a perspective room-temperature multiferroic material. A large spontaneous polarization was observed for the BaFe<sub>12</sub>O<sub>19</sub> ceramics revealing a clear ferroelectric hysteresis loop. The maximum polarization was estimated to be approximately 11.8 μC/cm<sup>2</sup>. The FeO<sub>6</sub> octahedron in its perovskite-like hexagonal unit cell and the shift of Fe<sup>3+</sup> off the center of octahedron are suggested to be the origin of the polarization in BaFe<sub>12</sub>O<sub>19</sub>. The magnetic field induced electric polarization has been also observed in the doped BaFe<sub>12-x-δ</sub>Sc<sub>x</sub>M<sub>δ</sub>O<sub>19</sub> (δ=0.05) at 10 K and in the BaSc<sub>x</sub>Fe<sub>12−x</sub>O<sub>19</sub> and SrSc<sub>x</sub>Fe<sub>12−x</sub>O<sub>19</sub> (x = 1.3–1.7) M-type hexaferrites. The investigated BaFe<sub>12-x</sub>D<sub>x</sub>O<sub>19</sub> (x=0.1, D-Al<sup>3+</sup>, In<sup>3+</sup>) samples have been obtained by two-step “topotactic” reactions. The powder neutron investigations of the samples were performed by neutron time of flight method at High Resolution Fourier Diffractometer. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=substituted%20hexaferrites" title="substituted hexaferrites">substituted hexaferrites</a>, <a href="https://publications.waset.org/abstracts/search?q=ferrimagnetics" title=" ferrimagnetics"> ferrimagnetics</a>, <a href="https://publications.waset.org/abstracts/search?q=ferroelectrics" title=" ferroelectrics"> ferroelectrics</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20powder%20diffraction" title=" neutron powder diffraction"> neutron powder diffraction</a>, <a href="https://publications.waset.org/abstracts/search?q=crystal%20and%20magnetic%20structures" title=" crystal and magnetic structures"> crystal and magnetic structures</a> </p> <a href="https://publications.waset.org/abstracts/52452/mechanism-of-dual-ferroic-properties-formation-in-substituted-m-type-hexaferrites" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/52452.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">257</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1449</span> Simulation and Characterization of Compact Magnetic Proton Recoil Spectrometer for Fast Neutron Spectra Measurements</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Xingyu%20Peng">Xingyu Peng</a>, <a href="https://publications.waset.org/abstracts/search?q=Qingyuan%20Hu"> Qingyuan Hu</a>, <a href="https://publications.waset.org/abstracts/search?q=Xuebin%20Zhu"> Xuebin Zhu</a>, <a href="https://publications.waset.org/abstracts/search?q=Xi%20Yuan"> Xi Yuan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Neutron spectrometry has contributed much to the development of nuclear physics since 1932 and has also become an importance tool in several other fields, notably nuclear technology, fusion plasma diagnostics and radiation protection. Compared with neutron fluxes, neutron spectra can provide more detailed information on the internal physical process of neutron sources, such as fast neutron reactors, fusion plasma, fission-fusion hybrid reactors, and so on. However, high performance neutron spectrometer is not so commonly available as it requires the use of large and complex instrumentation. This work describes the development and characterization of a compact magnetic proton recoil (MPR) spectrometer for high-resolution measurements of fast neutron spectra. The compact MPR spectrometer is featured by its large recoil angle, small size permanent analysis magnet, short beam transport line and dual-purpose detector array for both steady state and pulsed neutron spectra measurement. A 3-dimensional electromagnetic particle transport code is developed to simulate the response function of the spectrometer. Simulation results illustrate that the performance of the spectrometer is mainly determined by n-p recoil foil and proton apertures, and an overall energy resolution of 3% is achieved for 14 MeV neutrons. Dedicated experiments using alpha source and mono-energetic neutron beam are employed to verify the simulated response function of the compact MPR spectrometer. These experimental results show a good agreement with the simulated ones, which indicates that the simulation code possesses good accuracy and reliability. The compact MPR spectrometer described in this work is a valuable tool for fast neutron spectra measurements for the fission or fusion devices. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutron%20spectrometry" title="neutron spectrometry">neutron spectrometry</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetic%20proton%20recoil%20spectrometer" title=" magnetic proton recoil spectrometer"> magnetic proton recoil spectrometer</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20spectra" title=" neutron spectra"> neutron spectra</a>, <a href="https://publications.waset.org/abstracts/search?q=fast%20neutron" title=" fast neutron"> fast neutron</a> </p> <a href="https://publications.waset.org/abstracts/92156/simulation-and-characterization-of-compact-magnetic-proton-recoil-spectrometer-for-fast-neutron-spectra-measurements" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/92156.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">202</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1448</span> Production of Neutrons by High Intensity Picosecond Laser Interacting with Thick Solid Target at XingGuangIII</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Xi%20Yuan">Xi Yuan</a>, <a href="https://publications.waset.org/abstracts/search?q=Xuebin%20Zhu"> Xuebin Zhu</a>, <a href="https://publications.waset.org/abstracts/search?q=Bojun%20Li"> Bojun Li</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work describes the experiment to produce high-intensity pulsed neutron beams on XingGuangIII laser facility. The high-intensity laser is utilized to drive protons and deuterons, which hit a thick solid target to produce neutrons. The pulse duration of the laser used in the experiment is about 0.8 ps, and the laser energy is around 100 J. Protons and deuterons are accelerated from a 10-μm-thick deuterated polyethylene (CD₂) foil and diagnosed by a Thomson parabola ion-spectrometer. The energy spectrum of neutrons generated via ⁷Li(d,n) and ⁷Li(p,n) reaction when proton and deuteron beams hit a 5-mm-thick LiF target is measured by a scintillator-based time-of-flight spectrometer. Results from the neuron measurements show that the maximum neutron energy is about 12.5 MeV and the neutron yield is up to 2×10⁹/pulse. The high-intensity pulsed neutron beams demonstrated in this work can provide a valuable neutron source for material research, fast neutron induced fission research, and so on. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=picosecond%20laser%20driven" title="picosecond laser driven">picosecond laser driven</a>, <a href="https://publications.waset.org/abstracts/search?q=fast%20neutron" title=" fast neutron"> fast neutron</a>, <a href="https://publications.waset.org/abstracts/search?q=time-of-flight%20spectrometry" title=" time-of-flight spectrometry"> time-of-flight spectrometry</a>, <a href="https://publications.waset.org/abstracts/search?q=XinggungIII" title=" XinggungIII"> XinggungIII</a> </p> <a href="https://publications.waset.org/abstracts/92159/production-of-neutrons-by-high-intensity-picosecond-laser-interacting-with-thick-solid-target-at-xingguangiii" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/92159.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">165</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1447</span> Standardization Of Miniature Neutron Research Reactor And Occupational Safety Analysis</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Raymond%20Limen%20Njinga">Raymond Limen Njinga</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The comparator factors (Fc) for miniature research reactors are of great importance in the field of nuclear physics as it provide accurate bases for the evaluation of elements in all form of samples via ko-NAA techniques. The Fc was initially simulated theoretically thereafter, series of experiments were performed to validate the results. In this situation, the experimental values were obtained using the alloy of Au(0.1%) - Al monitor foil and a neutron flux setting of 5.00E+11 cm-2.s-1. As was observed in the inner irradiation position, the average experimental value of 7.120E+05 was reported against the theoretical value of 7.330E+05. In comparison, a percentage deviation of 2.86 (from theoretical value) was observed. In the large case of the outer irradiation position, the experimental value of 1.170E+06 was recorded against the theoretical value of 1.210E+06 with a percentage deviation of 3.310 (from the theoretical value). The estimation of equivalent dose rate at 5m from neutron flux of 5.00E+11 cm-2.s-1 within the neutron energies of 1KeV, 10KeV, 100KeV, 500KeV, 1MeV, 5MeV and 10MeV were calculated to be 0.01 Sv/h, 0.01 Sv/h, 0.03 Sv/h, 0.15 Sv/h, 0.21Sv/h and 0.25 Sv/h respectively with a total dose within a period of an hour was obtained to be 0.66 Sv. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutron%20flux" title="neutron flux">neutron flux</a>, <a href="https://publications.waset.org/abstracts/search?q=comparator%20factor" title=" comparator factor"> comparator factor</a>, <a href="https://publications.waset.org/abstracts/search?q=NAA%20techniques" title=" NAA techniques"> NAA techniques</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20energy" title=" neutron energy"> neutron energy</a>, <a href="https://publications.waset.org/abstracts/search?q=equivalent%20dose" title=" equivalent dose"> equivalent dose</a> </p> <a href="https://publications.waset.org/abstracts/142174/standardization-of-miniature-neutron-research-reactor-and-occupational-safety-analysis" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/142174.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">183</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1446</span> Application Research of Stilbene Crystal for the Measurement of Accelerator Neutron Sources</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Zhao%20Kuo">Zhao Kuo</a>, <a href="https://publications.waset.org/abstracts/search?q=Chen%20Liang"> Chen Liang</a>, <a href="https://publications.waset.org/abstracts/search?q=Zhang%20Zhongbing"> Zhang Zhongbing</a>, <a href="https://publications.waset.org/abstracts/search?q=Ruan%20Jinlu.%20He%20Shiyi"> Ruan Jinlu. He Shiyi</a>, <a href="https://publications.waset.org/abstracts/search?q=Xu%20Mengxuan"> Xu Mengxuan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Stilbene, C₁₄H₁₂, is well known as one of the most useful organic scintillators for pulse shape discrimination (PSD) technique for its good scintillation properties. An on-line acquisition system and an off-line acquisition system were developed with several CAMAC standard plug-ins, NIM plug-ins, neutron/γ discriminating plug-in named 2160A and a digital oscilloscope with high sampling rate respectively for which stilbene crystals and photomultiplier tube detectors (PMT) as detector for accelerator neutron sources measurement carried out in China Institute of Atomic Energy. Pulse amplitude spectrums and charge amplitude spectrums were real-time recorded after good neutron/γ discrimination whose best PSD figure-of-merits (FoMs) are 1.756 for D-D accelerator neutron source and 1.393 for D-T accelerator neutron source. The probability of neutron events in total events was 80%, and neutron detection efficiency was 5.21% for D-D accelerator neutron sources, which were 50% and 1.44% for D-T accelerator neutron sources after subtracting the background of scattering observed by the on-line acquisition system. Pulse waveform signals were acquired by the off-line acquisition system randomly while the on-line acquisition system working. The PSD FoMs obtained by the off-line acquisition system were 2.158 for D-D accelerator neutron sources and 1.802 for D-T accelerator neutron sources after waveform digitization off-line processing named charge integration method for just 1000 pulses. In addition, the probabilities of neutron events in total events obtained by the off-line acquisition system matched very well with the probabilities of the on-line acquisition system. The pulse information recorded by the off-line acquisition system could be repetitively used to adjust the parameters or methods of PSD research and obtain neutron charge amplitude spectrums or pulse amplitude spectrums after digital analysis with a limited number of pulses. The off-line acquisition system showed equivalent or better measurement effects compared with the online system with a limited number of pulses which indicated a feasible method based on stilbene crystals detectors for the measurement of prompt neutrons neutron sources like prompt accelerator neutron sources emit a number of neutrons in a short time. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=stilbene%20crystal" title="stilbene crystal">stilbene crystal</a>, <a href="https://publications.waset.org/abstracts/search?q=accelerator%20neutron%20source" title=" accelerator neutron source"> accelerator neutron source</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20%2F%20%CE%B3%20discrimination" title=" neutron / γ discrimination"> neutron / γ discrimination</a>, <a href="https://publications.waset.org/abstracts/search?q=figure-of-merits" title=" figure-of-merits"> figure-of-merits</a>, <a href="https://publications.waset.org/abstracts/search?q=CAMAC" title=" CAMAC"> CAMAC</a>, <a href="https://publications.waset.org/abstracts/search?q=waveform%20digitization" title=" waveform digitization"> waveform digitization</a> </p> <a href="https://publications.waset.org/abstracts/86807/application-research-of-stilbene-crystal-for-the-measurement-of-accelerator-neutron-sources" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/86807.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">187</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1445</span> Modeling of Cf-252 and PuBe Neutron Sources by Monte Carlo Method in Order to Develop Innovative BNCT Therapy</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Marta%20B%C5%82a%C5%BCkiewicz">Marta Błażkiewicz</a>, <a href="https://publications.waset.org/abstracts/search?q=Adam%20Konefa%C5%82"> Adam Konefał</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Currently, boron-neutron therapy is carried out mainly with the use of a neutron beam generated in research nuclear reactors. This fact limits the possibility of realization of a BNCT in centers distant from the above-mentioned reactors. Moreover, the number of active nuclear reactors in operation in the world is decreasing due to the limited lifetime of their operation and the lack of new installations. Therefore, the possibilities of carrying out boron-neutron therapy based on the neutron beam from the experimental reactor are shrinking. However, the use of nuclear power reactors for BNCT purposes is impossible due to the infrastructure not intended for radiotherapy. Therefore, a serious challenge is to find ways to perform boron-neutron therapy based on neutrons generated outside the research nuclear reactor. This work meets this challenge. Its goal is to develop a BNCT technique based on commonly available neutron sources such as Cf-252 and PuBe, which will enable the above-mentioned therapy in medical centers unrelated to nuclear research reactors. Advances in the field of neutron source fabrication make it possible to achieve strong neutron fluxes. The current stage of research focuses on the development of virtual models of the above-mentioned sources using the Monte Carlo simulation method. In this study, the GEANT4 tool was used, including the model for simulating neutron-matter interactions - High Precision Neutron. Models of neutron sources were developed on the basis of experimental verification based on the activation detectors method with the use of indium foil and the cadmium differentiation method allowing to separate the indium activation contribution from thermal and resonance neutrons. Due to the large number of factors affecting the result of the verification experiment, the 10% discrepancy between the simulation and experiment results was accepted. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=BNCT" title="BNCT">BNCT</a>, <a href="https://publications.waset.org/abstracts/search?q=virtual%20models" title=" virtual models"> virtual models</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20sources" title=" neutron sources"> neutron sources</a>, <a href="https://publications.waset.org/abstracts/search?q=monte%20carlo" title=" monte carlo"> monte carlo</a>, <a href="https://publications.waset.org/abstracts/search?q=GEANT4" title=" GEANT4"> GEANT4</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20activation%20detectors" title=" neutron activation detectors"> neutron activation detectors</a>, <a href="https://publications.waset.org/abstracts/search?q=gamma%20spectroscopy" title=" gamma spectroscopy"> gamma spectroscopy</a> </p> <a href="https://publications.waset.org/abstracts/143406/modeling-of-cf-252-and-pube-neutron-sources-by-monte-carlo-method-in-order-to-develop-innovative-bnct-therapy" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/143406.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">185</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1444</span> Measurement and Simulation of Axial Neutron Flux Distribution in Dry Tube of KAMINI Reactor</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Manish%20Chand">Manish Chand</a>, <a href="https://publications.waset.org/abstracts/search?q=Subhrojit%20Bagchi"> Subhrojit Bagchi</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Kumar"> R. Kumar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A new dry tube (DT) has been installed in the tank of KAMINI research reactor, Kalpakkam India. This tube will be used for neutron activation analysis of small to large samples and testing of neutron detectors. DT tube is 375 cm height and 7.5 cm in diameter, located 35 cm away from the core centre. The experimental thermal flux at various axial positions inside the tube has been measured by irradiating the flux monitor (¹⁹⁷Au) at 20kW reactor power. The measured activity of ¹⁹⁸Au and the thermal cross section of ¹⁹⁷Au (n,γ) ¹⁹⁸Au reaction were used for experimental thermal flux measurement. The flux inside the tube varies from 10⁹ to 10¹⁰ and maximum flux was (1.02 ± 0.023) x10¹⁰ n cm⁻²s⁻¹ at 36 cm from the bottom of the tube. The Au and Zr foils without and with cadmium cover of 1-mm thickness were irradiated at the maximum flux position in the DT to find out the irradiation specific input parameters like sub-cadmium to epithermal neutron flux ratio (f) and the epithermal neutron flux shape factor (α). The f value was 143 ± 5, indicates about 99.3% thermal neutron component and α value was -0.2886 ± 0.0125, indicates hard epithermal neutron spectrum due to insufficient moderation. The measured flux profile has been validated using theoretical model of KAMINI reactor through Monte Carlo N-Particle Code (MCNP). In MCNP, the complex geometry of the entire reactor is modelled in 3D, ensuring minimum approximations for all the components. Continuous energy cross-section data from ENDF-B/VII.1 as well as S (α, β) thermal neutron scattering functions are considered. The neutron flux has been estimated at the corresponding axial locations of the DT using mesh tally. The thermal flux obtained from the experiment shows good agreement with the theoretically predicted values by MCNP, it was within ± 10%. It can be concluded that this MCNP model can be utilized for calculating other important parameters like neutron spectra, dose rate, etc. and multi elemental analysis can be carried out by irradiating the sample at maximum flux position using measured f and α parameters by k₀-NAA standardization. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutron%20flux" title="neutron flux">neutron flux</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20activation%20analysis" title=" neutron activation analysis"> neutron activation analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20flux%20shape%20factor" title=" neutron flux shape factor"> neutron flux shape factor</a>, <a href="https://publications.waset.org/abstracts/search?q=MCNP" title=" MCNP"> MCNP</a>, <a href="https://publications.waset.org/abstracts/search?q=Monte%20Carlo%20N-Particle%20Code" title=" Monte Carlo N-Particle Code"> Monte Carlo N-Particle Code</a> </p> <a href="https://publications.waset.org/abstracts/99662/measurement-and-simulation-of-axial-neutron-flux-distribution-in-dry-tube-of-kamini-reactor" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/99662.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">164</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1443</span> Neutron Irradiated Austenitic Stainless Steels: An Applied Methodology for Nanoindentation and Transmission Electron Microscopy Studies</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=P.%20Bubl%C3%ADkova">P. Bublíkova</a>, <a href="https://publications.waset.org/abstracts/search?q=P.%20Halodova"> P. Halodova</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20K.%20Namburi"> H. K. Namburi</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20Stodolna"> J. Stodolna</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20Duchon"> J. Duchon</a>, <a href="https://publications.waset.org/abstracts/search?q=O.%20Libera"> O. Libera</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Neutron radiation-induced microstructural changes cause degradation of mechanical properties and the lifetime reduction of reactor internals during nuclear power plant operation. Investigating the effects of neutron irradiation on mechanical properties of the irradiated material (hardening, embrittlement) is challenging and time-consuming. Although the fast neutron spectrum has the major influence on microstructural properties, the thermal neutron effect is widely investigated owing to Irradiation-Assisted Stress Corrosion Cracking firstly observed in BWR stainless steels. In this study, 300-series austenitic stainless steels used as material for NPP's internals were examined after neutron irradiation at ~ 15 dpa. Although several nanoindentation experimental publications are available to determine the mechanical properties of ion irradiated materials, less is available on neutron irradiated materials at high dpa tested in hot-cells. In this work, we present particular methodology developed to determine the mechanical properties of neutron irradiated steels by nanoindentation technique. Furthermore, radiation-induced damage in the specimens was investigated by High Resolution - Transmission Electron Microscopy (HR-TEM) that showed the defect features, particularly Frank loops, cavity microstructure, radiation-induced precipitates and radiation-induced segregation. The results of nanoindentation measurements and associated nanoscale defect features showed the effect of irradiation-induced hardening. We also propose methodologies to optimized sample preparation for nanoindentation and microscotructural studies. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nanoindentation" title="nanoindentation">nanoindentation</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal%20neutrons" title=" thermal neutrons"> thermal neutrons</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20hardening" title=" radiation hardening"> radiation hardening</a>, <a href="https://publications.waset.org/abstracts/search?q=transmission%20electron%20microscopy" title=" transmission electron microscopy"> transmission electron microscopy</a> </p> <a href="https://publications.waset.org/abstracts/84677/neutron-irradiated-austenitic-stainless-steels-an-applied-methodology-for-nanoindentation-and-transmission-electron-microscopy-studies" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/84677.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">158</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1442</span> Reentrant Spin-Glass State Formation in Polycrystalline Er₂NiSi₃</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Santanu%20Pakhira">Santanu Pakhira</a>, <a href="https://publications.waset.org/abstracts/search?q=Chandan%20Mazumdar"> Chandan Mazumdar</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Ranganathan"> R. Ranganathan</a>, <a href="https://publications.waset.org/abstracts/search?q=Maxim%20Avdeev"> Maxim Avdeev</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Magnetically frustrated systems are of great interest and one of the most adorable topics for the researcher of condensed matter physics, due to their various interesting properties, viz. ground state degeneracy, finite entropy at zero temperature, lowering of ordering temperature, etc. Ternary intermetallics with the composition RE₂TX₃ (RE = rare-earth element, T= d electron transition metal and X= p electron element) crystallize in hexagonal AlB₂ type crystal structure (space group P6/mmm). In a hexagonal crystal structure with the antiferromagnetic interaction between the moments, the center moment is geometrically frustrated. Magnetic frustration along with disorder arrangements of non-magnetic ions are the building blocks for metastable spin-glass ground state formation for most of the compounds of this stoichiometry. The newly synthesized compound Er₂NiSi₃ compound forms in single phase in AlB₂ type structure with space group P6/mmm. The compound orders antiferromagnetically below 5.4 K and spin freezing of the frustrated magnetic moments occurs below 3 K for the compound. The compound shows magnetic relaxation behavior and magnetic memory effect below its freezing temperature. Neutron diffraction patterns for temperatures below the spin freezing temperature have been analyzed using FULLPROF software package. Diffuse magnetic scattering at low temperatures yields spin glass state formation for the compound. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=antiferromagnetism" title="antiferromagnetism">antiferromagnetism</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetic%20frustration" title=" magnetic frustration"> magnetic frustration</a>, <a href="https://publications.waset.org/abstracts/search?q=spin-glass" title=" spin-glass"> spin-glass</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20diffraction" title=" neutron diffraction"> neutron diffraction</a> </p> <a href="https://publications.waset.org/abstracts/73507/reentrant-spin-glass-state-formation-in-polycrystalline-er2nisi3" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/73507.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">263</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1441</span> The Development of a Residual Stress Measurement Method for Roll Formed Products</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yong%20Sun">Yong Sun</a>, <a href="https://publications.waset.org/abstracts/search?q=Vladimir%20Luzin"> Vladimir Luzin</a>, <a href="https://publications.waset.org/abstracts/search?q=Zhen%20Qian"> Zhen Qian</a>, <a href="https://publications.waset.org/abstracts/search?q=William%20J.%20T.%20Daniel"> William J. T. Daniel</a>, <a href="https://publications.waset.org/abstracts/search?q=Mingxing%20Zhang"> Mingxing Zhang</a>, <a href="https://publications.waset.org/abstracts/search?q=Shichao%20Ding"> Shichao Ding</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The residual stresses in roll formed products are generally very high and un-predictable. This is due to the occurrence of redundant plastic deformation in roll forming process and it can cause various product defects. Although the residual stresses of a roll formed product consist of longitudinal and transverse residual stresses components, but the longitudinal residual stresses plays a key role to the product defects of a roll formed product and therefore, only the longitudinal residual stresses concerned by the roll forming scholars and engineers. However, how to inspect the residual stresses of a product quickly and economically as a routine operation is still a challenge. This paper introduces a residual stresses measurement method called slope cutting method to study the longitudinal residual stresses through layers geometrically to a roll formed products or a product with similar process such as a rolled sheet. The detailed measuring procedure is given and discussed. The residual stresses variation through the layer can be derived based on the variation of curvature in different layers and steps. The slope cutting method has been explored and validated by experimental study on a roll-formed square tube. The neutron diffraction method is applied to validate the accuracy of the newly proposed layering removal materials results. The two set results agree with each other very well and therefore, the method is expected to be a routine testing method to monitor the quality of a product been formed and that is a great impact to roll forming industry. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=roll%20forming" title="roll forming">roll forming</a>, <a href="https://publications.waset.org/abstracts/search?q=residual%20stress" title=" residual stress"> residual stress</a>, <a href="https://publications.waset.org/abstracts/search?q=measurement%20method" title=" measurement method"> measurement method</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20diffraction" title=" neutron diffraction"> neutron diffraction</a> </p> <a href="https://publications.waset.org/abstracts/51177/the-development-of-a-residual-stress-measurement-method-for-roll-formed-products" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/51177.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">365</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1440</span> Application of Neutron-Gamma Technologies for Soil Elemental Content Determination and Mapping</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=G.%20Yakubova">G. Yakubova</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Kavetskiy"> A. Kavetskiy</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20A.%20Prior"> S. A. Prior</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20A.%20Torbert"> H. A. Torbert</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In-situ soil carbon determination over large soil surface areas (several hectares) is required in regard to carbon sequestration and carbon credit issues. This capability is important for optimizing modern agricultural practices and enhancing soil science knowledge. Collecting and processing representative field soil cores for traditional laboratory chemical analysis is labor-intensive and time-consuming. The neutron-stimulated gamma analysis method can be used for in-situ measurements of primary elements in agricultural soils (e.g., Si, Al, O, C, Fe, and H). This non-destructive method can assess several elements in large soil volumes with no need for sample preparation. Neutron-gamma soil elemental analysis utilizes gamma rays issued from different neutron-nuclei interactions. This process has become possible due to the availability of commercial portable pulse neutron generators, high-efficiency gamma detectors, reliable electronics, and measurement/data processing software complimented by advances in state-of-the-art nuclear physics methods. In Pulsed Fast Thermal Neutron Analysis (PFTNA), soil irradiation is accomplished using a pulsed neutron flux, and gamma spectra acquisition occurs both during and between pulses. This method allows the inelastic neutron scattering (INS) gamma spectrum to be separated from the thermal neutron capture (TNC) spectrum. Based on PFTNA, a mobile system for field-scale soil elemental determinations (primarily carbon) was developed and constructed. Our scanning methodology acquires data that can be directly used for creating soil elemental distribution maps (based on ArcGIS software) in a reasonable timeframe (~20-30 hectares per working day). Created maps are suitable for both agricultural purposes and carbon sequestration estimates. The measurement system design, spectra acquisition process, strategy for acquiring field-scale carbon content data, and mapping of agricultural fields will be discussed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutron%20gamma%20analysis" title="neutron gamma analysis">neutron gamma analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=soil%20elemental%20content" title=" soil elemental content"> soil elemental content</a>, <a href="https://publications.waset.org/abstracts/search?q=carbon%20sequestration" title=" carbon sequestration"> carbon sequestration</a>, <a href="https://publications.waset.org/abstracts/search?q=carbon%20credit" title=" carbon credit"> carbon credit</a>, <a href="https://publications.waset.org/abstracts/search?q=soil%20gamma%20spectroscopy" title=" soil gamma spectroscopy"> soil gamma spectroscopy</a>, <a href="https://publications.waset.org/abstracts/search?q=portable%20neutron%20generators" title=" portable neutron generators"> portable neutron generators</a>, <a href="https://publications.waset.org/abstracts/search?q=ArcMap%20mapping" title=" ArcMap mapping"> ArcMap mapping</a> </p> <a href="https://publications.waset.org/abstracts/162535/application-of-neutron-gamma-technologies-for-soil-elemental-content-determination-and-mapping" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/162535.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">90</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1439</span> Radiation Protection Assessment of the Emission of a d-t Neutron Generator: Simulations with MCNP Code and Experimental Measurements in Different Operating Conditions</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=G.%20M.%20Contessa">G. M. Contessa</a>, <a href="https://publications.waset.org/abstracts/search?q=L.%20Lepore"> L. Lepore</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20Gandolfo"> G. Gandolfo</a>, <a href="https://publications.waset.org/abstracts/search?q=C.%20Poggi"> C. Poggi</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Cherubini"> N. Cherubini</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Remetti"> R. Remetti</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Sandri"> S. Sandri</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Practical guidelines are provided in this work for the safe use of a portable d-t Thermo Scientific MP-320 neutron generator producing pulsed 14.1 MeV neutron beams. The neutron generator’s emission was tested experimentally and reproduced by MCNPX Monte Carlo code. Simulations were particularly accurate, even generator’s internal components were reproduced on the basis of ad-hoc collected X-ray radiographic images. Measurement campaigns were conducted under different standard experimental conditions using an LB 6411 neutron detector properly calibrated at three different energies, and comparing simulated and experimental data. In order to estimate the dose to the operator vs. the operating conditions and the energy spectrum, the most appropriate value of the conversion factor between neutron fluence and ambient dose equivalent has been identified, taking into account both direct and scattered components. The results of the simulations show that, in real situations, when there is no information about the neutron spectrum at the point where the dose has to be evaluated, it is possible - and in any case conservative - to convert the measured value of the count rate by means of the conversion factor corresponding to 14 MeV energy. This outcome has a general value when using this type of generator, enabling a more accurate design of experimental activities in different setups. The increasingly widespread use of this type of device for industrial and medical applications makes the results of this work of interest in different situations, especially as a support for the definition of appropriate radiation protection procedures and, in general, for risk analysis. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=instrumentation%20and%20monitoring" title="instrumentation and monitoring">instrumentation and monitoring</a>, <a href="https://publications.waset.org/abstracts/search?q=management%20of%20radiological%20safety" title=" management of radiological safety"> management of radiological safety</a>, <a href="https://publications.waset.org/abstracts/search?q=measurement%20of%20individual%20dose" title=" measurement of individual dose"> measurement of individual dose</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20protection%20of%20workers" title=" radiation protection of workers"> radiation protection of workers</a> </p> <a href="https://publications.waset.org/abstracts/76346/radiation-protection-assessment-of-the-emission-of-a-d-t-neutron-generator-simulations-with-mcnp-code-and-experimental-measurements-in-different-operating-conditions" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/76346.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">132</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1438</span> Radiation Annealing of Radiation Embrittlement of the Reactor Pressure Vessel</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=E.%20A.%20Krasikov">E. A. Krasikov</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Influence of neutron irradiation on RPV steel degradation are examined with reference to the possible reasons of the substantial experimental data scatter and furthermore – nonstandard (non-monotonous) and oscillatory embrittlement behavior. In our glance, this phenomenon may be explained by presence of the wavelike component in the embrittlement kinetics. We suppose that the main factor affecting steel anomalous embrittlement is fast neutron intensity (dose rate or flux), flux effect manifestation depends on state-of-the-art fluence level. At low fluencies, radiation degradation has to exceed normative value, then approaches to normative meaning and finally became sub normative. Data on radiation damage change including through the ex-service RPVs taking into account chemical factor, fast neutron fluence and neutron flux were obtained and analyzed. In our opinion, controversy in the estimation on neutron flux on radiation degradation impact may be explained by presence of the wavelike component in the embrittlement kinetics. Therefore, flux effect manifestation depends on fluence level. At low fluencies, radiation degradation has to exceed normative value, then approaches to normative meaning and finally became sub normative. Moreover as a hypothesis we suppose that at some stages of irradiation damaged metal have to be partially restored by irradiation i.e. neutron bombardment. Nascent during irradiation structure undergo occurring once or periodically transformation in a direction both degradation and recovery of the initial properties. According to our hypothesis, at some stage(s) of metal structure degradation neutron bombardment became recovering factor. As a result, oscillation arises that in turn leads to enhanced data scatter. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=annealing" title="annealing">annealing</a>, <a href="https://publications.waset.org/abstracts/search?q=embrittlement" title=" embrittlement"> embrittlement</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation" title=" radiation"> radiation</a>, <a href="https://publications.waset.org/abstracts/search?q=RPV%20steel" title=" RPV steel"> RPV steel</a> </p> <a href="https://publications.waset.org/abstracts/43961/radiation-annealing-of-radiation-embrittlement-of-the-reactor-pressure-vessel" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/43961.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">341</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1437</span> Feasibility Study and Experiment of On-Site Nuclear Material Identification in Fukushima Daiichi Fuel Debris by Compact Neutron Source</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yudhitya%20Kusumawati">Yudhitya Kusumawati</a>, <a href="https://publications.waset.org/abstracts/search?q=Yuki%20Mitsuya"> Yuki Mitsuya</a>, <a href="https://publications.waset.org/abstracts/search?q=Tomooki%20Shiba"> Tomooki Shiba</a>, <a href="https://publications.waset.org/abstracts/search?q=Mitsuru%20Uesaka"> Mitsuru Uesaka</a> </p> <p class="card-text"><strong>Abstract:</strong></p> After the Fukushima Daiichi nuclear power reactor incident, there are a lot of unaccountable nuclear fuel debris in the reactor core area, which is subject to safeguard and criticality safety. Before the actual precise analysis is performed, preliminary on-site screening and mapping of nuclear debris activity need to be performed to provide a reliable data on the nuclear debris mass-extraction planning. Through a collaboration project with Japan Atomic Energy Agency, an on-site nuclear debris screening system by using dual energy X-Ray inspection and neutron energy resonance analysis has been established. By using the compact and mobile pulsed neutron source constructed from 3.95 MeV X-Band electron linac, coupled with Tungsten as electron-to-photon converter and Beryllium as a photon-to-neutron converter, short-distance neutron Time of Flight measurement can be performed. Experiment result shows this system can measure neutron energy spectrum up to 100 eV range with only 2.5 meters Time of Flightpath in regards to the X-Band accelerator’s short pulse. With this, on-site neutron Time of Flight measurement can be used to identify the nuclear debris isotope contents through Neutron Resonance Transmission Analysis (NRTA). Some preliminary NRTA experiments have been done with Tungsten sample as dummy nuclear debris material, which isotopes Tungsten-186 has close energy absorption value with Uranium-238 (15 eV). The results obtained shows that this system can detect energy absorption in the resonance neutron area within 1-100 eV. It can also detect multiple elements in a material at once with the experiment using a combined sample of Indium, Tantalum, and silver makes it feasible to identify debris containing mixed material. This compact neutron Time of Flight measurement system is a great complementary for dual energy X-Ray Computed Tomography (CT) method that can identify atomic number quantitatively but with 1-mm spatial resolution and high error bar. The combination of these two measurement methods will able to perform on-site nuclear debris screening at Fukushima Daiichi reactor core area, providing the data for nuclear debris activity mapping. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutron%20source" title="neutron source">neutron source</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20resonance" title=" neutron resonance"> neutron resonance</a>, <a href="https://publications.waset.org/abstracts/search?q=nuclear%20debris" title=" nuclear debris"> nuclear debris</a>, <a href="https://publications.waset.org/abstracts/search?q=time%20of%20flight" title=" time of flight "> time of flight </a> </p> <a href="https://publications.waset.org/abstracts/93254/feasibility-study-and-experiment-of-on-site-nuclear-material-identification-in-fukushima-daiichi-fuel-debris-by-compact-neutron-source" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/93254.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">238</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1436</span> Neutronic Calculations for Central Test Loop in Heavy Water Research Reactor</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hadi%20Shamoradifar">Hadi Shamoradifar</a>, <a href="https://publications.waset.org/abstracts/search?q=Behzad%20Teimuri"> Behzad Teimuri</a>, <a href="https://publications.waset.org/abstracts/search?q=Parviz%20Parvaresh"> Parviz Parvaresh</a>, <a href="https://publications.waset.org/abstracts/search?q=Saeed%20Mohammadi"> Saeed Mohammadi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> One of the experimental facilities of the heavy water research reactor is the central test loop (C.T.L). It is located along the central axial line of the vessel, and therefore will highly affect the neutronic parameters of the reactor, so from the neutronics point of view, C.T.L is the most important facility. It is mainly designed for fuel testing, thought other applications such as radioisotope production and neutron activation, can be imagine for it. All of the simulations were performed by MCNPX2.6. As a first step towards C.T.L analysis, the effect of D2O-filled, H2O-filled, and He-filled C.T.L on the effective multiplication factor (Keff.), have been evaluated. According to results, H2O-filled C.T.L has a higher thermal neutron, while He-filled C.T.L includes more resonance neutrons. In the next step thermal and total axial neutron fluxes, were calculated and used as the comparison parameters. The core without C.T.L (C.T.L replaced by heavy water) is selected as the reference case, and the effect of all other cases is calculated according to that. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=heavy%20water%20reactor" title="heavy water reactor">heavy water reactor</a>, <a href="https://publications.waset.org/abstracts/search?q=neutronic%20calculations" title=" neutronic calculations"> neutronic calculations</a>, <a href="https://publications.waset.org/abstracts/search?q=central%20test%20loop" title=" central test loop"> central test loop</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20activation" title=" neutron activation"> neutron activation</a> </p> <a href="https://publications.waset.org/abstracts/64952/neutronic-calculations-for-central-test-loop-in-heavy-water-research-reactor" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/64952.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">363</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1435</span> Simulation of the Collimator Plug Design for Prompt-Gamma Activation Analysis in the IEA-R1 Nuclear Reactor</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Carlos%20G.%20Santos">Carlos G. Santos</a>, <a href="https://publications.waset.org/abstracts/search?q=Frederico%20A.%20Genezini"> Frederico A. Genezini</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20P.%20Dos%20Santos"> A. P. Dos Santos</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Yorivaz"> H. Yorivaz</a>, <a href="https://publications.waset.org/abstracts/search?q=P.%20T.%20D.%20Siqueira"> P. T. D. Siqueira</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The Prompt-Gamma Activation Analysis (PGAA) is a valuable technique for investigating the elemental composition of various samples. However, the installation of a PGAA system entails specific conditions such as filtering the neutron beam according to the target and providing adequate shielding for both users and detectors. These requirements incur substantial costs, exceeding $100,000, including manpower. Nevertheless, a cost-effective approach involves leveraging an existing neutron beam facility to create a hybrid system integrating PGAA and Neutron Tomography (NT). The IEA-R1 nuclear reactor at IPEN/USP possesses an NT facility with suitable conditions for adapting and implementing a PGAA device. The NT facility offers a thermal flux slightly colder and provides shielding for user protection. The key additional requirement involves designing detector shielding to mitigate high gamma ray background and safeguard the HPGe detector from neutron-induced damage. This study employs Monte Carlo simulations with the MCNP6 code to optimize the collimator plug for PGAA within the IEA-R1 NT facility. Three collimator models are proposed and simulated to assess their effectiveness in shielding gamma and neutron radiation from nucleon fission. The aim is to achieve a focused prompt-gamma signal while shielding ambient gamma radiation. The simulation results indicate that one of the proposed designs is particularly suitable for the PGAA-NT hybrid system. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=MCNP6.1" title="MCNP6.1">MCNP6.1</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron" title=" neutron"> neutron</a>, <a href="https://publications.waset.org/abstracts/search?q=prompt-gamma%20ray" title=" prompt-gamma ray"> prompt-gamma ray</a>, <a href="https://publications.waset.org/abstracts/search?q=prompt-gamma%20activation%20analysis" title=" prompt-gamma activation analysis"> prompt-gamma activation analysis</a> </p> <a href="https://publications.waset.org/abstracts/179265/simulation-of-the-collimator-plug-design-for-prompt-gamma-activation-analysis-in-the-iea-r1-nuclear-reactor" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/179265.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">75</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1434</span> Correlation Between Forbush-Decrease Amplitude Detected by Mountain Chacaltaya Neutron Monitor and Solar Wind Electric Filed</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sebwato%20Nasurudiin">Sebwato Nasurudiin</a>, <a href="https://publications.waset.org/abstracts/search?q=Akimasa%20Yoshikawa"> Akimasa Yoshikawa</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20Elsaid"> Ahmed Elsaid</a>, <a href="https://publications.waset.org/abstracts/search?q=Ayman%20Mahrous"> Ayman Mahrous</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study examines the correlation between the amplitude of Forbush Decreases (FDs) detected by the Mountain Chacaltaya neutron monitor and the solar wind electric field (E). Forbush Decreases, characterized by sudden drops in cosmic ray intensity, are typically associated with interplanetary coronal mass ejections (ICMEs) and high-speed solar wind streams. The Mountain Chacaltaya neutron monitor, located at a high altitude in Bolivia, offers an optimal setting for observing cosmic ray variations. The solar wind electric field, influenced by the solar wind velocity and interplanetary magnetic field, significantly impacts cosmic ray transport in the heliosphere. By analyzing neutron monitor data alongside solar wind parameters, we found a high correlation between E and FD amplitudes with a correlation factor of nearly 87%. The findings enhance our understanding of space weather processes, cosmic ray modulation, and solar-terrestrial interactions, providing valuable insights for predicting space weather events and mitigating their technological impacts. This study contributes to the broader astrophysics field by offering empirical data on cosmic ray modulation mechanisms. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cosmic%20rays" title="cosmic rays">cosmic rays</a>, <a href="https://publications.waset.org/abstracts/search?q=Forbush%20decrease" title=" Forbush decrease"> Forbush decrease</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20wind" title=" solar wind"> solar wind</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20monitor" title=" neutron monitor"> neutron monitor</a> </p> <a href="https://publications.waset.org/abstracts/188217/correlation-between-forbush-decrease-amplitude-detected-by-mountain-chacaltaya-neutron-monitor-and-solar-wind-electric-filed" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/188217.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">46</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1433</span> On-The-Fly Cross Sections Generation in Neutron Transport with Wide Energy Region</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rui%20Chen">Rui Chen</a>, <a href="https://publications.waset.org/abstracts/search?q=Shu-min%20Zhou"> Shu-min Zhou</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiong-jie%20Zhang"> Xiong-jie Zhang</a>, <a href="https://publications.waset.org/abstracts/search?q=Ren-bo%20Wang"> Ren-bo Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=Fan%20Huang"> Fan Huang</a>, <a href="https://publications.waset.org/abstracts/search?q=Bin%20Tang"> Bin Tang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> During the temperature changes in reactor core, the nuclide cross section in reactor can vary with temperature, which eventually causes the changes of reactivity. To simulate the interaction between incident neutron and various materials at different temperatures on the nose, it is necessary to generate all the relevant reaction temperature-dependent cross section. Traditionally, the real time cross section generation method is used to avoid storing huge data but contains severe problems of low efficiency and adaptability for narrow energy region. Focused on the research on multi-temperature cross sections generation in real time during in neutron transport, this paper investigated the on-the-fly cross section generation method for resolved resonance region, thermal region and unresolved resonance region, and proposed the real time multi-temperature cross sections generation method based on double-exponential formula for resolved resonance region, as well as the Neville interpolation for thermal and unresolved resonance region. To prove the correctness and validity of multi-temperature cross sections generation based on wide energy region of incident neutron, the proposed method was applied in critical safety benchmark tests, which showed the capability for application in reactor multi-physical coupling simulation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cross%20section" title="cross section">cross section</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20transport" title=" neutron transport"> neutron transport</a>, <a href="https://publications.waset.org/abstracts/search?q=numerical%20simulation" title=" numerical simulation"> numerical simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=on-the-fly" title=" on-the-fly"> on-the-fly</a> </p> <a href="https://publications.waset.org/abstracts/81585/on-the-fly-cross-sections-generation-in-neutron-transport-with-wide-energy-region" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/81585.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">197</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1432</span> Effects of Soil Neutron Irradiation in Soil Carbon Neutron Gamma Analysis</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Aleksandr%20Kavetskiy">Aleksandr Kavetskiy</a>, <a href="https://publications.waset.org/abstracts/search?q=Galina%20Yakubova"> Galina Yakubova</a>, <a href="https://publications.waset.org/abstracts/search?q=Nikolay%20Sargsyan"> Nikolay Sargsyan</a>, <a href="https://publications.waset.org/abstracts/search?q=Stephen%20A.%20Prior"> Stephen A. Prior</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Allen%20Torbert"> H. Allen Torbert</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The carbon sequestration question of modern times requires the development of an in-situ method of measuring soil carbon over large landmasses. Traditional chemical analytical methods used to evaluate large land areas require extensive soil sampling prior to processing for laboratory analysis; collectively, this is labor-intensive and time-consuming. An alternative method is to apply nuclear physics analysis, primarily in the form of pulsed fast-thermal neutron-gamma soil carbon analysis. This method is based on measuring the gamma-ray response that appears upon neutron irradiation of soil. Specific gamma lines with energies of 4.438 MeV appearing from neutron irradiation can be attributed to soil carbon nuclei. Based on measuring gamma line intensity, assessments of soil carbon concentration can be made. This method can be done directly in the field using a specially developed pulsed fast-thermal neutron-gamma system (PFTNA system). This system conducts in-situ analysis in a scanning mode coupled with GPS, which provides soil carbon concentration and distribution over large fields. The system has radiation shielding to minimize the dose rate (within radiation safety guidelines) for safe operator usage. Questions concerning the effect of neutron irradiation on soil health will be addressed. Information regarding absorbed neutron and gamma dose received by soil and its distribution with depth will be discussed in this study. This information was generated based on Monte-Carlo simulations (MCNP6.2 code) of neutron and gamma propagation in soil. Received data were used for the analysis of possible induced irradiation effects. The physical, chemical and biological effects of neutron soil irradiation were considered. From a physical aspect, we considered neutron (produced by the PFTNA system) induction of new isotopes and estimated the possibility of increasing the post-irradiation gamma background by comparisons to the natural background. An insignificant increase in gamma background appeared immediately after irradiation but returned to original values after several minutes due to the decay of short-lived new isotopes. From a chemical aspect, possible radiolysis of water (presented in soil) was considered. Based on stimulations of radiolysis of water, we concluded that the gamma dose rate used cannot produce gamma rays of notable rates. Possible effects of neutron irradiation (by the PFTNA system) on soil biota were also assessed experimentally. No notable changes were noted at the taxonomic level, nor was functional soil diversity affected. Our assessment suggested that the use of a PFTNA system with a neutron flux of 1e7 n/s for soil carbon analysis does not notably affect soil properties or soil health. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=carbon%20sequestration" title="carbon sequestration">carbon sequestration</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20gamma%20analysis" title=" neutron gamma analysis"> neutron gamma analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20effect%20on%20soil" title=" radiation effect on soil"> radiation effect on soil</a>, <a href="https://publications.waset.org/abstracts/search?q=Monte-Carlo%20simulation" title=" Monte-Carlo simulation"> Monte-Carlo simulation</a> </p> <a href="https://publications.waset.org/abstracts/149497/effects-of-soil-neutron-irradiation-in-soil-carbon-neutron-gamma-analysis" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/149497.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">143</span> </span> </div> </div> <ul class="pagination"> <li class="page-item disabled"><span class="page-link">&lsaquo;</span></li> <li class="page-item active"><span class="page-link">1</span></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=neutron%20diffraction&page=2">2</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=neutron%20diffraction&page=3">3</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=neutron%20diffraction&page=4">4</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=neutron%20diffraction&page=5">5</a></li> <li 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