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radiation</title> <meta name="description" content="Search results for: gamma radiation"> <meta name="keywords" content="gamma radiation"> <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="gamma radiation"> <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> 1722</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: gamma radiation</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1572</span> Optical Properties of N-(Hydroxymethyl) Acrylamide Polymer Gel Dosimeters for Radiation Therapy</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Khalid%20A.%20Rabaeh">Khalid A. Rabaeh</a>, <a href="https://publications.waset.org/abstracts/search?q=Belal%20Moftah"> Belal Moftah</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20A.%20Basfar"> Ahmed A. Basfar</a>, <a href="https://publications.waset.org/abstracts/search?q=Akram%20A.%20Almousa"> Akram A. Almousa</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Polymer gel dosimeters are tissue equivalent martial that fabricated from radiation sensitive chemicals which, upon irradiation, polymerize as a function of absorbed radiation dose. Polymer gel dosimeters can uniquely record the radiation dose distribution in three-dimensions (3D). A novel composition of normoxic polymer gel dosimeters based on radiation-induced polymerization of N-(Hydroxymethyl)acrylamide (NHMA) is introduced in this study for radiotherapy treatment planning. The dosimeters were irradiated by 10 MV photon beam of a medical linear accelerator at a constant dose rate of 600 cGy/min with doses up to 30 Gy. The polymerization degree is directly proportional to absorbed dose received by the polymer gel. UV/Vis spectrophotometer was used to investigate the degree of white color of irradiated NHMA gel which is associated to the degree of polymerization of polymer gel dosimeters. The absorbance increases with absorbed dose for all gel dosimeters in the dose range between 0 and 30 Gy. Dose rate , energy of radiation and the stability of the polymerization after irradiation were investigated. No appreciable effects of these parameters on the performance of the novel gel dosimeters were observed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dosimeter" title="dosimeter">dosimeter</a>, <a href="https://publications.waset.org/abstracts/search?q=gel" title=" gel"> gel</a>, <a href="https://publications.waset.org/abstracts/search?q=spectrophotometer" title=" spectrophotometer"> spectrophotometer</a>, <a href="https://publications.waset.org/abstracts/search?q=N-%28Hydroxymethyl%29acrylamide" title=" N-(Hydroxymethyl)acrylamide "> N-(Hydroxymethyl)acrylamide </a> </p> <a href="https://publications.waset.org/abstracts/34646/optical-properties-of-n-hydroxymethyl-acrylamide-polymer-gel-dosimeters-for-radiation-therapy" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/34646.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">469</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">1571</span> Gamma-Hydroxybutyrate (GHB): A Review for the Prehospital Clinician</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Theo%20Welch">Theo Welch</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Background: Gamma-hydroxybutyrate (GHB) is a depressant of the central nervous system with euphoric effects. It is being increasingly used recreationally in the United Kingdom (UK) despite associated morbidity and mortality. Due to the lack of evidence, healthcare professionals remain unsure as to the optimum management of GHB acute toxicity. Methods: A literature review was undertaken of its pharmacology and the emergency management of its acute toxicity.Findings: GHB is inexpensive and readily available over the Internet. Treatment of GHB acute toxicity is supportive. Clinicians should pay particular attention to the airway as emesis is common. Intubation is required in a minority of cases. Polydrug use is common and worsens prognosis. Conclusion: An inexpensive and readily available drug, GHB acute toxicity can be difficult to identify and treat. GHB acute toxicity is generally treated conservatively. Further research is needed to ascertain the indications, benefits, and risks of intubating patients with GHB acute toxicity. instructions give you guidelines for preparing papers for the conference. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=GHB" title="GHB">GHB</a>, <a href="https://publications.waset.org/abstracts/search?q=gamma-hydroxybutyrate" title=" gamma-hydroxybutyrate"> gamma-hydroxybutyrate</a>, <a href="https://publications.waset.org/abstracts/search?q=prehospital" title=" prehospital"> prehospital</a>, <a href="https://publications.waset.org/abstracts/search?q=emergency" title=" emergency"> emergency</a>, <a href="https://publications.waset.org/abstracts/search?q=toxicity" title=" toxicity"> toxicity</a>, <a href="https://publications.waset.org/abstracts/search?q=management" title=" management"> management</a> </p> <a href="https://publications.waset.org/abstracts/141712/gamma-hydroxybutyrate-ghb-a-review-for-the-prehospital-clinician" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/141712.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">201</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">1570</span> Overview and Pathophysiology of Radiation-Induced Breast Changes as a Consequence of Radiotherapy Toxicity</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Monika%20Rezacova">Monika Rezacova</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Radiation-induced breast changes are a consequence of radiotherapy toxicity over the breast tissues either related to targeted breast cancer treatment or other thoracic malignancies (eg. lung cancer). This study has created an overview of different changes and their pathophysiology. The main conditions included were skin thickening, interstitial oedema, fat necrosis, dystrophic calcifications, skin retractions, glandular atrophy, breast fibrosis and radiation induced breast cancer. This study has performed focused literature search through multiple databases including pubmed, medline and embase. The study has reviewed English as well as non English publications. As a result of the literature the study provides comprehensive overview of radiation-induced breast changes and their pathophysiology with small focus on new development and prevention. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=radiotherapy%20toxicity" title="radiotherapy toxicity">radiotherapy toxicity</a>, <a href="https://publications.waset.org/abstracts/search?q=breast%20tissue%20changes" title=" breast tissue changes"> breast tissue changes</a>, <a href="https://publications.waset.org/abstracts/search?q=breast%20cancer%20treatment" title=" breast cancer treatment"> breast cancer treatment</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation-induced%20breast%20changes" title=" radiation-induced breast changes"> radiation-induced breast changes</a> </p> <a href="https://publications.waset.org/abstracts/137891/overview-and-pathophysiology-of-radiation-induced-breast-changes-as-a-consequence-of-radiotherapy-toxicity" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/137891.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">159</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">1569</span> Enhancing Sensitization of Cervical Cancer Cells to γ-Radiation Ellagic Acid</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Vidhula%20Ahire">Vidhula Ahire</a>, <a href="https://publications.waset.org/abstracts/search?q=Amit%20Kumar"> Amit Kumar</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20P.%20Mishra"> K. P. Mishra</a>, <a href="https://publications.waset.org/abstracts/search?q=Gauri%20Kulkarni"> Gauri Kulkarni</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Herbal polyphenols have gained significance because of their increasing promise in prevention and treatment of cancer. Therefore, development of a dietary compound as an effective radiosensitizer and a radioprotector is highly warranted for cervical cancer patients undergoing therapy. This study describes the cytotoxic effects of the flavonoid, ellagic acid (EA) when administered either alone or in combination with gamma radiation on cervical cancer HeLa cells in vitro. Apoptotic index and proliferation were measured by using trypan blue assay. Reproductive cell death was analyzed by clonogenic assay. Propidium iodide staining for flowcytometry was performed to analyze cell cycle modulation. Nuclear and mitochondrial changes were studied with specific dyes. DNA repair kinetics was analyzed by immunofluorescence assay. Evaluation and comparison of EA effects were performed with other clinically used breast cancer drugs. When tumor cells were exposed to 2 and 4 Gy of irradiation in presence of EA (10 μM), it yielded a synergistic cytotoxic effect on cervical cancer cells whereas in NIH3T3 cells it reversed the injury caused by irradiation and abetted in the regaining of normal healthy cells. At 24h ~25foci/cell was observed and 2.6 fold decrease in the mitochondrial membrane potential. Up to 40% cell were arrested in the G1 phase and 20-36% cells exhibited apoptosis. Our results demonstrate the role of increased apoptosis and cell cycle modulation in the mechanism of EA mediated radiosensitization of cervical cancer cells and thus advocating EA as an adjuvant for preclinical trials in cancer chemo- radiotherapy. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cervical%20cancer" title="cervical cancer">cervical cancer</a>, <a href="https://publications.waset.org/abstracts/search?q=ellagic%20acid" title=" ellagic acid"> ellagic acid</a>, <a href="https://publications.waset.org/abstracts/search?q=sensitization" title=" sensitization"> sensitization</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20therapy" title=" radiation therapy"> radiation therapy</a> </p> <a href="https://publications.waset.org/abstracts/61006/enhancing-sensitization-of-cervical-cancer-cells-to-gh-radiation-ellagic-acid" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/61006.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">322</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">1568</span> Simulation of Hamming Coding and Decoding for Microcontroller Radiation Hardening</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rehab%20I.%20Abdul%20Rahman">Rehab I. Abdul Rahman</a>, <a href="https://publications.waset.org/abstracts/search?q=Mazhar%20B.%20Tayel"> Mazhar B. Tayel</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper presents a method of hardening the 8051 microcontroller, that able to assure reliable operation in the presence of bit flips caused by radiation. Aiming at avoiding such faults in the 8051 microcontroller, Hamming code protection was used in its SRAM memory and registers. A VHDL code and its simulation have been used for this hamming code protection. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=radiation" title="radiation">radiation</a>, <a href="https://publications.waset.org/abstracts/search?q=hardening" title=" hardening"> hardening</a>, <a href="https://publications.waset.org/abstracts/search?q=bitflip" title=" bitflip"> bitflip</a>, <a href="https://publications.waset.org/abstracts/search?q=hamming" title=" hamming"> hamming</a> </p> <a href="https://publications.waset.org/abstracts/20963/simulation-of-hamming-coding-and-decoding-for-microcontroller-radiation-hardening" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/20963.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">499</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">1567</span> Natural Radionuclides and Doses Assessment in Soil Samples from Agbara Industrial Estate, Ogun State, Nigeria</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ayorinde%20B.%20Ogunremi">Ayorinde B. Ogunremi</a>, <a href="https://publications.waset.org/abstracts/search?q=Kehinde%20A.%20Adewoyin"> Kehinde A. Adewoyin</a>, <a href="https://publications.waset.org/abstracts/search?q=Adebamwo%20Adebayo"> Adebamwo Adebayo</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Record of radionuclide concentration in an environment is essential to ensure human safety due to exposure to ionizing radiation. This study aimed at assessing the radionuclide concentration and doses from soil samples in the study area. Twenty soil samples were collected and dried in the oven at 110°C to remove the moisture, pulverized, and sieved. 200 g of each of the samples were sealed in cylindrical sample holders; they were left for four weeks to attain secular equilibrium between ²²⁶Ra and its decay daughters, after which the sample was analyzed using gamma-ray spectrometry. After the well-guided procedure for the calibrations, the analysis of the samples was carried out using a well-calibrated NaI (TI) and well-shielded detector coupled to a computer resident quantum MCA2100 R Multichannel analyzer for 36,000 s. The mean activity concentrations of ⁴⁰K, ²²⁶Ra, and ²³²Th obtained were calculated to be 272.37 ± 33.58, 10.97 ± 3.24, 9.39 ± 2.27 Bqkg-1 respectively. The average absorbed dose obtained was 22.10 nGy/h. The radium equivalent activity (Raeq) was estimated to be 43.27 Bq/kg. The activity concentrations (Bq/kg) were below the recommended values, which are 420, 33, and 45 for ⁴⁰K, ²²⁶Ra, and ²³²Th, respectively. Considering the results, we conclude thus, the radiation level within the estate poses no significant health risk on dwellers and workers. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=absorbed" title="absorbed">absorbed</a>, <a href="https://publications.waset.org/abstracts/search?q=effective" title=" effective"> effective</a>, <a href="https://publications.waset.org/abstracts/search?q=multichannel" title=" multichannel"> multichannel</a>, <a href="https://publications.waset.org/abstracts/search?q=radionuclide" title=" radionuclide"> radionuclide</a> </p> <a href="https://publications.waset.org/abstracts/138452/natural-radionuclides-and-doses-assessment-in-soil-samples-from-agbara-industrial-estate-ogun-state-nigeria" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/138452.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">216</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">1566</span> Global and Diffuse Solar Radiation Studies over Seven Cities of Sindh, Pakistan for Power Generation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20A.%20Ahmed">M. A. Ahmed</a>, <a href="https://publications.waset.org/abstracts/search?q=Sidra%20A.%20Shaik"> Sidra A. Shaik</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Global and diffuse solar radiation on horizontal surface over seven cities of Sindh namely Karachi, Hyderabad, Chore, Padidan, Nawabshah, Rohri and Jacobabad were carried out using sunshine hour data of the area to assess the feasibility of solar energy utilization at Sindh province. The result obtained shows a variation of direct and diffuse component of solar radiation in summer and winter months in southern Sindh (50% direct and 50% diffuse for Karachi, and Hyderabad) where there is a large variation in direct and diffuse component of solar radiation in summer and winter months in northern region (80% direct and 20% diffuse for Rohri and Jacobabad). In southern Sindh, the contribution of diffuse solar radiation is higher during the monsoon months (July and August). The sky remains clear during September to June. In northern Sindh (Rohri and Jacobabad) the contribution of diffuse solar radiation is low even in monsoon months i,e in July and August. The Kt value for northern Sindh indicates a clear sky. In northern part of the Sindh percentage of diffuse radiation does not exceed more than 20%. The appearance of cloud is rare. From the point of view of power generation, the estimated values indicate that northern part of Sindh has high solar potential while the southern part has low solar potential. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=global%20and%20diffuse%20solar%20radiation" title="global and diffuse solar radiation">global and diffuse solar radiation</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20potential" title=" solar potential"> solar potential</a>, <a href="https://publications.waset.org/abstracts/search?q=Province%20of%20Sindh" title=" Province of Sindh"> Province of Sindh</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20radiation%20studies%20for%20power%20generation" title=" solar radiation studies for power generation"> solar radiation studies for power generation</a> </p> <a href="https://publications.waset.org/abstracts/64201/global-and-diffuse-solar-radiation-studies-over-seven-cities-of-sindh-pakistan-for-power-generation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/64201.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">317</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">1565</span> Evaluation of a Hybrid Configuration for Active Space Radiation Bio-Shielding</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jiahui%20Song">Jiahui Song</a>, <a href="https://publications.waset.org/abstracts/search?q=Ravindra%20P.%20Joshi"> Ravindra P. Joshi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> One of the biggest obstacles to human space exploration of the solar system is the risk posed by prolonged exposure to space radiation. It is generally agreed that particles with energies around 1-2 GeV per nucleon are the most damaging to humans. Passive shielding techniques entail using solid material to create a shield that prevents particles from penetrating a given region by absorbing the energy of incident particles. Previous techniques resulted in adding ‘dead mass’ to spacecraft, which is not an economically viable solution. Additionally, collisions of the incoming ionized particles with traditional passive protective material lead to secondary radiation. This study develops an enhanced hybrid active space radiation bio-shielding concept, a combination of the electrostatic and magnetostatic shielding, by varying the size of the magnetic ring, and by having multiple current-carrying rings, to mitigate the biohazards of severe space radiation for the success of deep-space explorations. The simulation results show an unprecedented reduction of 1GeV GCR (Galactic Cosmic Rays) proton transmission to about 15%. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bio-shielding" title="bio-shielding">bio-shielding</a>, <a href="https://publications.waset.org/abstracts/search?q=electrostatic" title=" electrostatic"> electrostatic</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetostatic" title=" magnetostatic"> magnetostatic</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation" title=" radiation"> radiation</a> </p> <a href="https://publications.waset.org/abstracts/40427/evaluation-of-a-hybrid-configuration-for-active-space-radiation-bio-shielding" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40427.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">394</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">1564</span> Thorium-Doped PbS Thin Films for Radiation Damage Studies</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Michael%20Shandalov">Michael Shandalov</a>, <a href="https://publications.waset.org/abstracts/search?q=Tzvi%20Templeman"> Tzvi Templeman</a>, <a href="https://publications.waset.org/abstracts/search?q=Michael%20Schmidt"> Michael Schmidt</a>, <a href="https://publications.waset.org/abstracts/search?q=Itzhak%20Kelson"> Itzhak Kelson</a>, <a href="https://publications.waset.org/abstracts/search?q=Eyal%20Yahel"> Eyal Yahel</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We present a new method to produce a model system for the study of radiation damage in non-radioactive materials. The method is based on homogeneously incorporating 228Th ions in PbS thin films using a small volume chemical bath deposition (CBD) technique. The common way to alloy metals with radioactive elements is by melting pure elements, which requires considerable amounts of radioactive material with its safety consequences such as high sample activity. Controlled doping of the thin films with (very) small amounts (100-200ppm) of radioactive elements such as thorium is expected to provide a unique path for studying radiation damage in materials due to decay processes without the need of sealed enclosure. As a first stage, we developed CBD process for controlled doping of PbS thin films (~100 nm thick) with the stable isotope (t1/2~106 years), 232Th. Next, we developed CBD process for controlled doping of PbS thin films with active 228Th isotope. This was achieved by altering deposition parameters such as temperature, pH, reagent concentrations and time. The 228Th-doped films were characterized using X-ray diffraction, which indicated a single phase material. Film morphology and thickness were determined using scanning electron microscopy (SEM). Energy dispersive spectroscopy (EDS) mapping in the analytical transmission electron microscope (A-TEM), X-ray photoelectron spectroscopy (XPS) depth profiles and autoradiography indicated that the Th ions were homogeneously distributed throughout the films, suggesting Pb substitution by Th ions in the crystal lattice. The properties of the PbS (228Th) film activity were investigated by using alpha-spectroscopy and gamma spectroscopy. The resulting films are applicable for isochronal annealing of resistivity measurements and currently under investigation. This work shows promise as a model system for the analysis of dilute defect systems in semiconductor thin films. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=thin%20films" title="thin films">thin films</a>, <a href="https://publications.waset.org/abstracts/search?q=doping" title=" doping"> doping</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20damage" title=" radiation damage"> radiation damage</a>, <a href="https://publications.waset.org/abstracts/search?q=chemical%20bath%20deposition" title=" chemical bath deposition"> chemical bath deposition</a> </p> <a href="https://publications.waset.org/abstracts/31401/thorium-doped-pbs-thin-films-for-radiation-damage-studies" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/31401.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">393</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">1563</span> Spatio-Temporal Changes of Rainfall in São Paulo, Brazil (1973-2012): A Gamma Distribution and Cluster Analysis</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Guilherme%20Henrique%20Gabriel">Guilherme Henrique Gabriel</a>, <a href="https://publications.waset.org/abstracts/search?q=Luc%C3%AD%20Hidalgo%20Nunes"> Lucí Hidalgo Nunes</a> </p> <p class="card-text"><strong>Abstract:</strong></p> An important feature of rainfall regimes is the variability, which is subject to the atmosphere’s general and regional dynamics, geographical position and relief. Despite being inherent to the climate system, it can harshly impact virtually all human activities. In turn, global climate change has the ability to significantly affect smaller-scale rainfall regimes by altering their current variability patterns. In this regard, it is useful to know if regional climates are changing over time and whether it is possible to link these variations to climate change trends observed globally. This study is part of an international project (Metropole-FAPESP, Proc. 2012/51876-0 and Proc. 2015/11035-5) and the objective was to identify and evaluate possible changes in rainfall behavior in the state of São Paulo, southeastern Brazil, using rainfall data from 79 rain gauges for the last forty years. Cluster analysis and gamma distribution parameters were used for evaluating spatial and temporal trends, and the outcomes are presented by means of geographic information systems tools. Results show remarkable changes in rainfall distribution patterns in São Paulo over the years: changes in shape and scale parameters of gamma distribution indicate both an increase in the irregularity of rainfall distribution and the probability of occurrence of extreme events. Additionally, the spatial outcome of cluster analysis along with the gamma distribution parameters suggest that changes occurred simultaneously over the whole area, indicating that they could be related to remote causes beyond the local and regional ones, especially in a current global climate change scenario. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=climate%20change" title="climate change">climate change</a>, <a href="https://publications.waset.org/abstracts/search?q=cluster%20analysis" title=" cluster analysis"> cluster analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=gamma%20distribution" title=" gamma distribution"> gamma distribution</a>, <a href="https://publications.waset.org/abstracts/search?q=rainfall" title=" rainfall"> rainfall</a> </p> <a href="https://publications.waset.org/abstracts/71373/spatio-temporal-changes-of-rainfall-in-sao-paulo-brazil-1973-2012-a-gamma-distribution-and-cluster-analysis" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/71373.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">319</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">1562</span> Synchrotron Radiation and Inverse Compton Scattering in Astrophysical Plasma</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20S.%20Sathiesh">S. S. Sathiesh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The aim of this project is to study the radiation mechanism synchrotron and Inverse Compton scattering. Theoretically, we discussed spectral energy distribution for both. Programming is done for plotting the graph of Power-law spectrum for synchrotron Radiation using fortran90. The importance of power law spectrum was discussed and studied to infer its physical parameters from the model fitting. We also discussed how to infer the physical parameters from the theoretically drawn graph, we have seen how one can infer B (magnetic field of the source), γ min, γ max, spectral indices (p1, p2) while fitting the curve to the observed data. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=blazars%2Fquasars" title="blazars/quasars">blazars/quasars</a>, <a href="https://publications.waset.org/abstracts/search?q=beaming" title=" beaming"> beaming</a>, <a href="https://publications.waset.org/abstracts/search?q=synchrotron%20radiation" title=" synchrotron radiation"> synchrotron radiation</a>, <a href="https://publications.waset.org/abstracts/search?q=Synchrotron%20Self%20Compton" title=" Synchrotron Self Compton"> Synchrotron Self Compton</a>, <a href="https://publications.waset.org/abstracts/search?q=inverse%20Compton%20scattering" title=" inverse Compton scattering"> inverse Compton scattering</a>, <a href="https://publications.waset.org/abstracts/search?q=mrk421" title=" mrk421 "> mrk421 </a> </p> <a href="https://publications.waset.org/abstracts/33368/synchrotron-radiation-and-inverse-compton-scattering-in-astrophysical-plasma" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33368.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">413</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">1561</span> Freeform Lens System for Collimation SERS irradiation Radiation Produced by Biolayers which Deposit on High Quality Resonant System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Iuliia%20Riabenko">Iuliia Riabenko</a>, <a href="https://publications.waset.org/abstracts/search?q=Konstantin%20Beloshenko"> Konstantin Beloshenko</a>, <a href="https://publications.waset.org/abstracts/search?q=Sergey%20Shulga"> Sergey Shulga</a>, <a href="https://publications.waset.org/abstracts/search?q=Valeriy%20Shulga"> Valeriy Shulga</a> </p> <p class="card-text"><strong>Abstract:</strong></p> An optical system has been developed consisting of a TIR lens and an aspherical surface designed to collect Stokes radiation from biomolecules. The freeform material is SYLGARD-184, which provides a low level of noise associated with the luminescence of the substrate. The refractive index of SYLGARD-184 is 1.4028 for a wavelength of 632 nm, the Abbe number is 72, these material parameters make it possible to design the desired shape for the wavelength range of 640-700 nm. The system consists of a TIR lens, inside which is placed a high-quality resonant system consisting of a biomolecule and a metal colloid. This system can be described using the coupled oscillator model. The laser excitation radiation was fed through the base of the TIR lens. The sample was mounted inside the TIR lens at a distance of 8 mm from the base. As a result of Raman scattering of laser radiation, a Stokes bend appeared from the biolayer. The task of this work was that it was necessary to collect this radiation emitted at a 4π steradian angle. For this, an internal aspherical surface was used, which made it possible to defocus the beam emanating from the biolayer and direct its radiation to the borders of the TIR lens at the Brewster angle. The collated beam of Stokes radiation contains 97% of the energy scattered by the biolayer. Thus, a simple scheme was proposed for collecting and collimating the Stokes radiation of biomolecules. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=TIR%20lens" title="TIR lens">TIR lens</a>, <a href="https://publications.waset.org/abstracts/search?q=freeform%20material" title=" freeform material"> freeform material</a>, <a href="https://publications.waset.org/abstracts/search?q=raman%20scattering" title=" raman scattering"> raman scattering</a>, <a href="https://publications.waset.org/abstracts/search?q=biolayer" title=" biolayer"> biolayer</a>, <a href="https://publications.waset.org/abstracts/search?q=brewster%20angle" title=" brewster angle"> brewster angle</a> </p> <a href="https://publications.waset.org/abstracts/158241/freeform-lens-system-for-collimation-sers-irradiation-radiation-produced-by-biolayers-which-deposit-on-high-quality-resonant-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/158241.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">138</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">1560</span> Evaluation of a Data Fusion Algorithm for Detecting and Locating a Radioactive Source through Monte Carlo N-Particle Code Simulation and Experimental Measurement</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hadi%20Ardiny">Hadi Ardiny</a>, <a href="https://publications.waset.org/abstracts/search?q=Amir%20Mohammad%20Beigzadeh"> Amir Mohammad Beigzadeh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Through the utilization of a combination of various sensors and data fusion methods, the detection of potential nuclear threats can be significantly enhanced by extracting more information from different data. In this research, an experimental and modeling approach was employed to track a radioactive source by combining a surveillance camera and a radiation detector (NaI). To run this experiment, three mobile robots were utilized, with one of them equipped with a radioactive source. An algorithm was developed in identifying the contaminated robot through correlation between camera images and camera data. The computer vision method extracts the movements of all robots in the XY plane coordinate system, and the detector system records the gamma-ray count. The position of the robots and the corresponding count of the moving source were modeled using the MCNPX simulation code while considering the experimental geometry. The results demonstrated a high level of accuracy in finding and locating the target in both the simulation model and experimental measurement. The modeling techniques prove to be valuable in designing different scenarios and intelligent systems before initiating any experiments. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nuclear%20threats" title="nuclear threats">nuclear threats</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20detector" title=" radiation detector"> radiation detector</a>, <a href="https://publications.waset.org/abstracts/search?q=MCNPX%20simulation" title=" MCNPX simulation"> MCNPX simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=modeling%20techniques" title=" modeling techniques"> modeling techniques</a>, <a href="https://publications.waset.org/abstracts/search?q=intelligent%20systems" title=" intelligent systems"> intelligent systems</a> </p> <a href="https://publications.waset.org/abstracts/167591/evaluation-of-a-data-fusion-algorithm-for-detecting-and-locating-a-radioactive-source-through-monte-carlo-n-particle-code-simulation-and-experimental-measurement" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/167591.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">123</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">1559</span> Assessment of Occupational Exposure and Individual Radio-Sensitivity in People Subjected to Ionizing Radiation </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Oksana%20G.%20Cherednichenko">Oksana G. Cherednichenko</a>, <a href="https://publications.waset.org/abstracts/search?q=Anastasia%20L.%20Pilyugina"> Anastasia L. Pilyugina</a>, <a href="https://publications.waset.org/abstracts/search?q=Sergey%20N.Lukashenko"> Sergey N.Lukashenko</a>, <a href="https://publications.waset.org/abstracts/search?q=Elena%20G.%20Gubitskaya"> Elena G. Gubitskaya</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The estimation of accumulated radiation doses in people professionally exposed to ionizing radiation was performed using methods of biological (chromosomal aberrations frequency in lymphocytes) and physical (radionuclides analysis in urine, whole-body radiation meter, individual thermoluminescent dosimeters) dosimetry. A group of 84 "A" category employees after their work in the territory of former Semipalatinsk test site (Kazakhstan) was investigated. The dose rate in some funnels exceeds 40 μSv/h. After radionuclides determination in urine using radiochemical and WBC methods, it was shown that the total effective dose of personnel internal exposure did not exceed 0.2 mSv/year, while an acceptable dose limit for staff is 20 mSv/year. The range of external radiation doses measured with individual thermo-luminescent dosimeters was 0.3-1.406 µSv. The cytogenetic examination showed that chromosomal aberrations frequency in staff was 4.27±0.22%, which is significantly higher than at the people from non-polluting settlement Tausugur (0.87±0.1%) (р ≤ 0.01) and citizens of Almaty (1.6±0.12%) (р≤ 0.01). Chromosomal type aberrations accounted for 2.32±0.16%, 0.27±0.06% of which were dicentrics and centric rings. The cytogenetic analysis of different types group radiosensitivity among «professionals» (age, sex, ethnic group, epidemiological data) revealed no significant differences between the compared values. Using various techniques by frequency of dicentrics and centric rings, the average cumulative radiation dose for group was calculated, and that was 0.084-0.143 Gy. To perform comparative individual dosimetry using physical and biological methods of dose assessment, calibration curves (including own ones) and regression equations based on general frequency of chromosomal aberrations obtained after irradiation of blood samples by gamma-radiation with the dose rate of 0,1 Gy/min were used. Herewith, on the assumption of individual variation of chromosomal aberrations frequency (1–10%), the accumulated dose of radiation varied 0-0.3 Gy. The main problem in the interpretation of individual dosimetry results is reduced to different reaction of the objects to irradiation - radiosensitivity, which dictates the need of quantitative definition of this individual reaction and its consideration in the calculation of the received radiation dose. The entire examined contingent was assigned to a group based on the received dose and detected cytogenetic aberrations. Radiosensitive individuals, at the lowest received dose in a year, showed the highest frequency of chromosomal aberrations (5.72%). In opposite, radioresistant individuals showed the lowest frequency of chromosomal aberrations (2.8%). The cohort correlation according to the criterion of radio-sensitivity in our research was distributed as follows: radio-sensitive (26.2%) — medium radio-sensitivity (57.1%), radioresistant (16.7%). Herewith, the dispersion for radioresistant individuals is 2.3; for the group with medium radio-sensitivity — 3.3; and for radio-sensitive group — 9. These data indicate the highest variation of characteristic (reactions to radiation effect) in the group of radio-sensitive individuals. People with medium radio-sensitivity show significant long-term correlation (0.66; n=48, β ≥ 0.999) between the values of doses defined according to the results of cytogenetic analysis and dose of external radiation obtained with the help of thermoluminescent dosimeters. Mathematical models based on the type of violation of the radiation dose according to the professionals radiosensitivity level were offered. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=biodosimetry" title="biodosimetry">biodosimetry</a>, <a href="https://publications.waset.org/abstracts/search?q=chromosomal%20aberrations" title=" chromosomal aberrations"> chromosomal aberrations</a>, <a href="https://publications.waset.org/abstracts/search?q=ionizing%20radiation" title=" ionizing radiation"> ionizing radiation</a>, <a href="https://publications.waset.org/abstracts/search?q=radiosensitivity" title=" radiosensitivity"> radiosensitivity</a> </p> <a href="https://publications.waset.org/abstracts/74455/assessment-of-occupational-exposure-and-individual-radio-sensitivity-in-people-subjected-to-ionizing-radiation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/74455.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">184</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">1558</span> Comparison of Catalyst Support for High Pressure Reductive Amination</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tz-Bang%20Du">Tz-Bang Du</a>, <a href="https://publications.waset.org/abstracts/search?q=Cheng-Han%20Hsieh"> Cheng-Han Hsieh</a>, <a href="https://publications.waset.org/abstracts/search?q=Li-Ping%20Ju"> Li-Ping Ju</a>, <a href="https://publications.waset.org/abstracts/search?q=Hung-Jie%20Liou"> Hung-Jie Liou</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Polyether amines synthesize by secondary hydroxyl polyether diol play an important role in epoxy hardener. The low molecular weight product is used in low viscosity and high transparent polyamine product for the logo, ground cover, especially for wind turbine blade, while the high molecular weight products are used in advanced agricultures such as a high-speed railway. High-pressure reductive amination process is required for producing these amines. In the condition of higher than 150 atm pressure and 200 degrees Celsius temperature, supercritical ammonia is used as a reactant and also a solvent. It would be a great challenge to select a catalyst support for such high-temperature alkaline circumstance. In this study, we have established a six-autoclave-type (SAT) high-pressure reactor for amination catalyst screening, which six experiment conditions with different temperature and pressure could be examined at the same time. We synthesized copper-nickel catalyst on different shaped alumina catalyst support and evaluated the catalyst activity for high-pressure reductive amination of polypropylene glycol (PPG) by SAT reactor. Ball type gamma alumina, ball type activated alumina and pellet type gamma alumina catalyst supports are evaluated in this study. Gamma alumina supports have shown better activity on PPG reductive amination than activated alumina support. In addition, the catalysts are evaluated in fixed bed reactor. The diamine product was successfully synthesized via this catalyst and the strength of the catalysts is measured. The crush strength of blank supports is about 13.5 lb for both gamma alumina and activated alumina. The strength increases to 20.3 lb after synthesized to be copper-nickel catalyst. After test in the fixed bed high-pressure reductive amination process for 100 hours, the crush strength of the used catalyst is 3.7 lb for activated alumina support, 12.0 lb for gamma alumina support. The gamma alumina is better than activated alumina to use as catalyst support in high-pressure reductive amination process. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=high%20pressure%20reductive%20amination" title="high pressure reductive amination">high pressure reductive amination</a>, <a href="https://publications.waset.org/abstracts/search?q=copper%20nickel%20catalyst" title=" copper nickel catalyst"> copper nickel catalyst</a>, <a href="https://publications.waset.org/abstracts/search?q=polyether%20amine" title=" polyether amine"> polyether amine</a>, <a href="https://publications.waset.org/abstracts/search?q=alumina" title=" alumina"> alumina</a> </p> <a href="https://publications.waset.org/abstracts/47166/comparison-of-catalyst-support-for-high-pressure-reductive-amination" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/47166.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">229</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">1557</span> Improvements in Double Q-Learning for Anomalous Radiation Source Searching</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Bo-Bin%20Xiaoa">Bo-Bin Xiaoa</a>, <a href="https://publications.waset.org/abstracts/search?q=Chia-Yi%20Liua"> Chia-Yi Liua</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In the task of searching for anomalous radiation sources, personnel holding radiation detectors to search for radiation sources may be exposed to unnecessary radiation risk, and automated search using machines becomes a required project. The research uses various sophisticated algorithms, which are double Q learning, dueling network, and NoisyNet, of deep reinforcement learning to search for radiation sources. The simulation environment, which is a 10*10 grid and one shielding wall setting in it, improves the development of the AI model by training 1 million episodes. In each episode of training, the radiation source position, the radiation source intensity, agent position, shielding wall position, and shielding wall length are all set randomly. The three algorithms are applied to run AI model training in four environments where the training shielding wall is a full-shielding wall, a lead wall, a concrete wall, and a lead wall or a concrete wall appearing randomly. The 12 best performance AI models are selected by observing the reward value during the training period and are evaluated by comparing these AI models with the gradient search algorithm. The results show that the performance of the AI model, no matter which one algorithm, is far better than the gradient search algorithm. In addition, the simulation environment becomes more complex, the AI model which applied Double DQN combined Dueling and NosiyNet algorithm performs better. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=double%20Q%20learning" title="double Q learning">double Q learning</a>, <a href="https://publications.waset.org/abstracts/search?q=dueling%20network" title="dueling network">dueling network</a>, <a href="https://publications.waset.org/abstracts/search?q=NoisyNet" title="NoisyNet">NoisyNet</a>, <a href="https://publications.waset.org/abstracts/search?q=source%20searching" title="source searching">source searching</a> </p> <a href="https://publications.waset.org/abstracts/144663/improvements-in-double-q-learning-for-anomalous-radiation-source-searching" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/144663.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">112</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">1556</span> Environmental Radioactivity Analysis by a Sequential Approach</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=G.%20Medkour%20Ishak-Boushaki">G. Medkour Ishak-Boushaki</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Taibi"> A. Taibi</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Allab"> M. Allab</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Quantitative environmental radioactivity measurements are needed to determine the level of exposure of a population to ionizing radiations and for the assessment of the associated risks. Gamma spectrometry remains a very powerful tool for the analysis of radionuclides present in an environmental sample but the basic problem in such measurements is the low rate of detected events. Using large environmental samples could help to get around this difficulty but, unfortunately, new issues are raised by gamma rays attenuation and self-absorption. Recently, a new method has been suggested, to detect and identify without quantification, in a short time, a gamma ray of a low count source. This method does not require, as usually adopted in gamma spectrometry measurements, a pulse height spectrum acquisition. It is based on a chronological record of each detected photon by simultaneous measurements of its energy ε and its arrival time τ on the detector, the pair parameters [ε,τ] defining an event mode sequence (EMS). The EMS serials are analyzed sequentially by a Bayesian approach to detect the presence of a given radioactive source. The main object of the present work is to test the applicability of this sequential approach in radioactive environmental materials detection. Moreover, for an appropriate health oversight of the public and of the concerned workers, the analysis has been extended to get a reliable quantification of the radionuclides present in environmental samples. For illustration, we consider as an example, the problem of detection and quantification of 238U. Monte Carlo simulated experience is carried out consisting in the detection, by a Ge(Hp) semiconductor junction, of gamma rays of 63 keV emitted by 234Th (progeny of 238U). The generated EMS serials are analyzed by a Bayesian inference. The application of the sequential Bayesian approach, in environmental radioactivity analysis, offers the possibility of reducing the measurements time without requiring large environmental samples and consequently avoids the attached inconvenient. The work is still in progress. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Bayesian%20approach" title="Bayesian approach">Bayesian approach</a>, <a href="https://publications.waset.org/abstracts/search?q=event%20mode%20sequence" title=" event mode sequence"> event mode sequence</a>, <a href="https://publications.waset.org/abstracts/search?q=gamma%20spectrometry" title=" gamma spectrometry"> gamma spectrometry</a>, <a href="https://publications.waset.org/abstracts/search?q=Monte%20Carlo%20method" title=" Monte Carlo method"> Monte Carlo method</a> </p> <a href="https://publications.waset.org/abstracts/34310/environmental-radioactivity-analysis-by-a-sequential-approach" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/34310.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">495</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">1555</span> The Concentration of Selected Cosmogenic and Anthropogenic Radionuclides in the Ground Layer of the Atmosphere (Polar and Mid-Latitudes Regions)</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20Burakowska">A. Burakowska</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Piotrowski"> M. Piotrowski</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Kubicki"> M. Kubicki</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Trzaskowska"> H. Trzaskowska</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Sosnowiec"> R. Sosnowiec</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20Myslek-Laurikainen"> B. Myslek-Laurikainen</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The most important source of atmospheric radioactivity are radionuclides generated as a result of the impact of primary and secondary cosmic radiation, with the nuclei of nitrogen oxygen and carbon in the upper troposphere and lower stratosphere. This creates about thirty radioisotopes of more than twenty elements. For organisms, the four of them are most important: ³H, ⁷Be, ²²Na, ¹⁴C. The natural radionuclides, which are present in Earth crust, also settle on dust and particles of water vapor. By this means, the derivatives of uranium and thorium, and long-life 40K get into the air. ¹³⁷Cs is the most widespread isotope, that is implemented by humans into the environment. To determine the concentration of radionuclides in the atmosphere, high volume air samplers were used, where the aerosol collection took place on a special filter fabric (Petrianov filter tissue FPP-15-1.5). In 2002 the high volume air sampler AZA-1000 was installed at the Polish Polar Observatory of the Polish Academy of Science in Hornsund, Spitsbergen (77°00’N, 15°33’E), designed to operate in all weather conditions of the cold polar region. Since 1991 (with short breaks) the ASS-500 air sampler has been working, which is located in Swider at the Kalinowski Geophysical Observatory of Geophysics Institute of the Polish Academy of Science (52°07’N, 21°15’E). The following results of radionuclides concentrations were obtained from both stations using gamma spectroscopy analysis: ⁷Be, ¹³⁷Cs, ¹³⁴Cs, ²¹⁰Pb, ⁴⁰K. For gamma spectroscopy analysis HPGe (High Purity Germanium) detector were used. These data were compared with each other. The preliminary results gave evidence that radioactivity measured in aerosols is not proportional to the amount of dust for both studied regions. Furthermore, the results indicate annual variability (seasonal fluctuations) as well as a decrease in the average activity of ⁷Be with increasing latitude. The content of ⁷Be in surface air also indicates the relationship with solar activity cycles. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aerosols" title="aerosols">aerosols</a>, <a href="https://publications.waset.org/abstracts/search?q=air%20filters" title=" air filters"> air filters</a>, <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20beryllium" title=" atmospheric beryllium"> atmospheric beryllium</a>, <a href="https://publications.waset.org/abstracts/search?q=environmental%20radionuclides" title=" environmental radionuclides"> environmental radionuclides</a>, <a href="https://publications.waset.org/abstracts/search?q=gamma%20spectroscopy" title=" gamma spectroscopy"> gamma spectroscopy</a>, <a href="https://publications.waset.org/abstracts/search?q=mid-latitude%20regions%20radionuclides" title=" mid-latitude regions radionuclides"> mid-latitude regions radionuclides</a>, <a href="https://publications.waset.org/abstracts/search?q=polar%20regions%20radionuclides" title=" polar regions radionuclides"> polar regions radionuclides</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20cycles" title=" solar cycles"> solar cycles</a> </p> <a href="https://publications.waset.org/abstracts/108340/the-concentration-of-selected-cosmogenic-and-anthropogenic-radionuclides-in-the-ground-layer-of-the-atmosphere-polar-and-mid-latitudes-regions" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/108340.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">140</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">1554</span> Reduction of the Risk of Secondary Cancer Induction Using VMAT for Head and Neck Cancer</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jalil%20ur%20Rehman">Jalil ur Rehman</a>, <a href="https://publications.waset.org/abstracts/search?q=Ramesh%20C"> Ramesh C</a>, <a href="https://publications.waset.org/abstracts/search?q=Tailor"> Tailor</a>, <a href="https://publications.waset.org/abstracts/search?q=Isa%20Khan"> Isa Khan</a>, <a href="https://publications.waset.org/abstracts/search?q=Jahanzeeb%20Ashraf"> Jahanzeeb Ashraf</a>, <a href="https://publications.waset.org/abstracts/search?q=Muhammad%20Afzal"> Muhammad Afzal</a>, <a href="https://publications.waset.org/abstracts/search?q=Geofferry%20S.%20Ibbott"> Geofferry S. Ibbott</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The purpose of this analysis is to estimate secondary cancer risks after VMAT compared to other modalities of head and neck radiotherapy (IMRT, 3DCRT). Computer tomography (CT) scans of Radiological Physics Center (RPC) head and neck phantom were acquired with CT scanner and exported via DICOM to the treatment planning system (TPS). Treatment planning was done using four arc (182-178 and 180-184, clockwise and anticlockwise) for volumetric modulated arc therapy (VMAT) , Nine fields (200, 240, 280, 320,0,40,80,120 and 160), which has been commonly used at MD Anderson Cancer Center Houston for intensity modulated radiation therapy (IMRT) and four fields for three dimensional radiation therapy (3DCRT) were used. True beam linear accelerator of 6MV photon energy was used for dose delivery, and dose calculation was done with CC convolution algorithm with prescription dose of 6.6 Gy. Primary Target Volume (PTV) coverage, mean and maximal doses, DVHs and volumes receiving more than 2 Gy and 3.8 Gy of OARs were calculated and compared. Absolute point dose and planar dose were measured with thermoluminescent dosimeters (TLDs) and GafChromic EBT2 film, respectively. Quality Assurance of VMAT and IMRT were performed by using ArcCHECK method with gamma index criteria of 3%/3mm dose difference to distance to agreement (DD/DTA). PTV coverage was found 90.80 %, 95.80 % and 95.82 % for 3DCRT, IMRT and VMAT respectively. VMAT delivered the lowest maximal doses to esophagus (2.3 Gy), brain (4.0 Gy) and thyroid (2.3 Gy) compared to all other studied techniques. In comparison, maximal doses for 3DCRT were found higher than VMAT for all studied OARs. Whereas, IMRT delivered maximal higher doses 26%, 5% and 26% for esophagus, normal brain and thyroid, respectively, compared to VMAT. It was noted that esophagus volume receiving more than 2 Gy was 3.6 % for VMAT, 23.6 % for IMRT and up to 100 % for 3DCRT. Good agreement was observed between measured doses and those calculated with TPS. The averages relative standard errors (RSE) of three deliveries within eight TLD capsule locations were, 0.9%, 0.8% and 0.6% for 3DCRT, IMRT and VMAT, respectively. The gamma analysis for all plans met the ±5%/3 mm criteria (over 90% passed) and results of QA were greater than 98%. The calculations for maximal doses and volumes of OARs suggest that the estimated risk of secondary cancer induction after VMAT is considerably lower than IMRT and 3DCRT. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=RPC" title="RPC">RPC</a>, <a href="https://publications.waset.org/abstracts/search?q=3DCRT" title=" 3DCRT"> 3DCRT</a>, <a href="https://publications.waset.org/abstracts/search?q=IMRT" title=" IMRT"> IMRT</a>, <a href="https://publications.waset.org/abstracts/search?q=VMAT" title=" VMAT"> VMAT</a>, <a href="https://publications.waset.org/abstracts/search?q=EBT2%20film" title=" EBT2 film"> EBT2 film</a>, <a href="https://publications.waset.org/abstracts/search?q=TLD" title=" TLD"> TLD</a> </p> <a href="https://publications.waset.org/abstracts/6403/reduction-of-the-risk-of-secondary-cancer-induction-using-vmat-for-head-and-neck-cancer" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/6403.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">507</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">1553</span> Therapeutic Effects of Toll Like Receptor 9 Ligand CpG-ODN on Radiation Injury</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jianming%20Cai">Jianming Cai</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Exposure to ionizing radiation causes severe damage to human body and an safe and effective radioprotector is urgently required for alleviating radiation damage. In 2008, flagellin, an agonist of TLR5, was found to exert radioprotective effects on radiation injury through activating NF-kB signaling pathway. From then, the radioprotective effects of TLR ligands has shed new lights on radiation protection. CpG-ODN is an unmethylated oligonucleotide which activates TLR9 signaling pathway. In this study, we demonstrated that CpG-ODN has therapeutic effects on radiation injuries induced by γ ray and 12C6+ heavy ion particles. Our data showed that CpG-ODN increased the survival rate of mice after whole body irradiation and increased the number of leukocytes as well as the bone marrow cells. CpG-ODN also alleviated radiation damage on intestinal crypt through regulating apoptosis signaling pathway including bcl2, bax, and caspase 3 etc. By using a radiation-induced pulmonary fibrosis model, we found that CpG-ODN could alleviate structural damage, within 20 week after whole–thorax 15Gy irradiation. In this model, Th1/Th2 imbalance induced by irradiation was also reversed by CpG-ODN. We also found that TGFβ-Smad signaling pathway was regulated by CpG-ODN, which accounts for the therapeutic effects of CpG-ODN in radiation-induced pulmonary injury. On another hand, for high LET radiation protection, we investigated protective effects of CpG-ODN against 12C6+ heavy ion irradiation and found that after CpG-ODN treatment, the apoptosis and cell cycle arrest induced by 12C6+ irradiation was reduced. CpG-ODN also reduced the expression of Bax and caspase 3, while increased the level of bcl2. Then we detected the effect of CpG-ODN on heavy ion induced immune dysfunction. Our data showed that CpG-ODN increased the survival rate of mice and also the leukocytes after 12C6+ irradiation. Besides, the structural damage of immune organ such as thymus and spleen was also alleviated by CpG-ODN treatment. In conclusion, we found that TLR9 ligand, CpG-ODN reduced radiation injuries in response to γ ray and 12C6+ heavy ion irradiation. On one hand, CpG-ODN inhibited the activation of apoptosis induced by radiation through regulating bcl2, bax and caspase 3. On another hand, through activating TLR9, CpG-ODN recruit MyD88-IRAK-TRAF6 complex, activating TAK1, IRF5 and NF-kB pathway, and thus alleviates radiation damage. This study provides novel insights into protection and therapy of radiation damages. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=TLR9" title="TLR9">TLR9</a>, <a href="https://publications.waset.org/abstracts/search?q=CpG-ODN" title=" CpG-ODN"> CpG-ODN</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20injury" title=" radiation injury"> radiation injury</a>, <a href="https://publications.waset.org/abstracts/search?q=high%20LET%20radiation" title=" high LET radiation"> high LET radiation</a> </p> <a href="https://publications.waset.org/abstracts/35124/therapeutic-effects-of-toll-like-receptor-9-ligand-cpg-odn-on-radiation-injury" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/35124.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">480</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">1552</span> Predicting Dose Level and Length of Time for Radiation Exposure Using Gene Expression</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Chao%20Sima">Chao Sima</a>, <a href="https://publications.waset.org/abstracts/search?q=Shanaz%20Ghandhi"> Shanaz Ghandhi</a>, <a href="https://publications.waset.org/abstracts/search?q=Sally%20A.%20Amundson"> Sally A. Amundson</a>, <a href="https://publications.waset.org/abstracts/search?q=Michael%20L.%20Bittner"> Michael L. Bittner</a>, <a href="https://publications.waset.org/abstracts/search?q=David%20J.%20Brenner"> David J. Brenner</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In a large-scale radiologic emergency, potentially affected population need to be triaged efficiently using various biomarkers where personal dosimeters are not likely worn by the individuals. It has long been established that radiation injury can be estimated effectively using panels of genetic biomarkers. Furthermore, the rate of radiation, in addition to dose of radiation, plays a major role in determining biological responses. Therefore, a better and more accurate triage involves estimating both the dose level of the exposure and the length of time of that exposure. To that end, a large in vivo study was carried out on mice with internal emitter caesium-137 (¹³⁷Cs). Four different injection doses of ¹³⁷Cs were used: 157.5 μCi, 191 μCi, 214.5μCi, and 259 μCi. Cohorts of 6~7 mice from the control arm and each of the dose levels were sacrificed, and blood was collected 2, 3, 5, 7 and 14 days after injection for microarray RNA gene expression analysis. Using a generalized linear model with penalized maximum likelihood, a panel of 244 genes was established and both the doses of injection and the number of days after injection were accurately predicted for all 155 subjects using this panel. This has proven that microarray gene expression can be used effectively in radiation biodosimetry in predicting both the dose levels and the length of exposure time, which provides a more holistic view on radiation exposure and helps improving radiation damage assessment and treatment. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=caesium-137" title="caesium-137">caesium-137</a>, <a href="https://publications.waset.org/abstracts/search?q=gene%20expression%20microarray" title=" gene expression microarray"> gene expression microarray</a>, <a href="https://publications.waset.org/abstracts/search?q=multivariate%20responses%20prediction" title=" multivariate responses prediction"> multivariate responses prediction</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20biodosimetry" title=" radiation biodosimetry"> radiation biodosimetry</a> </p> <a href="https://publications.waset.org/abstracts/88188/predicting-dose-level-and-length-of-time-for-radiation-exposure-using-gene-expression" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/88188.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">198</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">1551</span> Generalized Uncertainty Principle Modified Hawking Radiation in Bumblebee Gravity</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sara%20Kanzi">Sara Kanzi</a>, <a href="https://publications.waset.org/abstracts/search?q=Izzet%20Sakalli"> Izzet Sakalli</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The effect of Lorentz symmetry breaking (LSB) on the Hawking radiation of Schwarzschild-like black hole found in the bumblebee gravity model (SBHBGM) is studied in the framework of quantum gravity. To this end, we consider Hawking radiation spin-0 (bosons) and spin-12particles (fermions), which go in and out through the event horizon of the SBHBGM. We use the modified Klein-Gordon and Dirac equations, which are obtained from the generalized uncertainty principle (GUP) to show how Hawking radiation is affected by the GUP and LSB. In particular, we reveal that independent of the spin of the emitted particles, GUP causes a change in the Hawking temperature of the SBHBGM. Furthermore, we compute the semi-analytic greybody factors (for both bosons and fermions) of the SBHBGM. Thus, we reveal that LSB is effective on the greybody factor of the SBHBGM such that its redundancy decreases the value of the greybody factor. Our findings are graphically depicted. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bumblebee%20gravity%20model" title="bumblebee gravity model">bumblebee gravity model</a>, <a href="https://publications.waset.org/abstracts/search?q=Hawking%20radiation" title=" Hawking radiation"> Hawking radiation</a>, <a href="https://publications.waset.org/abstracts/search?q=generalized%20uncertainty%20principle" title=" generalized uncertainty principle"> generalized uncertainty principle</a>, <a href="https://publications.waset.org/abstracts/search?q=Lorentz%20symmetry%20breaking" title=" Lorentz symmetry breaking"> Lorentz symmetry breaking</a> </p> <a href="https://publications.waset.org/abstracts/120400/generalized-uncertainty-principle-modified-hawking-radiation-in-bumblebee-gravity" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/120400.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">136</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">1550</span> Effect of Acute Dose of Mobile Phone Radiation on Life Cycle ‎of the Mosquito, Culex univittatus</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fatma%20H.%20Galal">Fatma H. Galal</a>, <a href="https://publications.waset.org/abstracts/search?q=Alaaeddeen%20M.%20Seufi"> Alaaeddeen M. Seufi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Due to the increasing usage of mobile phone, experiments were designed to investigate ‎the effect of acute dose exposure on the mosquito life cycle. 50 tubes (5 ml size) ‎containing 3 ml water and a first instar larva of the mosquito, Culex univittatus were put ‎between two mobile cell phones switched on talking mode for 4 continuous hours. A ‎control group of tubes (unexposed to radiation) were used. Larval and pupal durations ‎were calculated. Furthermore, adult emergence and sex ratio were observed for both ‎treated and control larvae. Results indicated that the employed dose of radiation reduced ‎total larval duration to about half the value of control. 1st, 2nd, 3rd and 4th larval ‎durations were reduced significantly by mobile radiation when compared to controls. ‎Meanwhile pupal duration was elongated significantly by mobile radiation when ‎compared to control. Sex ratio was significantly shifted in favor of females in the case of ‎radiated mosquitoes. Successful adult emergence was decreased significantly in the case ‎of radiated insects when compared to controls. Molecular studies to investigate the ‎effects of mobile radiation on insects and other model organisms are going on.‎ <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=mosquito" title="mosquito">mosquito</a>, <a href="https://publications.waset.org/abstracts/search?q=mobilr%20radiation" title=" mobilr radiation"> mobilr radiation</a>, <a href="https://publications.waset.org/abstracts/search?q=larval%20and%20pupal%20durations" title=" larval and pupal durations"> larval and pupal durations</a>, <a href="https://publications.waset.org/abstracts/search?q=sex%20ratio" title=" sex ratio"> sex ratio</a> </p> <a href="https://publications.waset.org/abstracts/39685/effect-of-acute-dose-of-mobile-phone-radiation-on-life-cycle-of-the-mosquito-culex-univittatus" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/39685.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">1549</span> Calculation of Organs Radiation Dose in Cervical Carcinoma External Irradiation Beam Using Day’s Methods</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yousif%20M.%20Yousif%20Abdallah">Yousif M. Yousif Abdallah</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20E.%20Gar-Elnabi"> Mohamed E. Gar-Elnabi</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdoelrahman%20H.%20A.%20Bakary"> Abdoelrahman H. A. Bakary</a>, <a href="https://publications.waset.org/abstracts/search?q=Alaa%20M.%20H.%20Eltoum"> Alaa M. H. Eltoum</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdelazeem%20K.%20M.%20Ali"> Abdelazeem K. M. Ali</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The study was established to measure the amount of radiation outside the treatment field in external beam radiation therapy using day method of dose calculation, the data was collected from 89 patients of cervical carcinoma in order to determine if the dose outside side the irradiation treatment field for spleen, liver, both kidneys, small bowel, large colon, skin within the acceptable limit or not. The cervical field included mainly 4 organs which are bladder, rectum part of small bowel and hip joint these organ received mean dose of (4781.987±281.321), (4736.91±331.8), (4647.64±387.1) and (4745.91±321.11) respectively. The mean dose received by outfield organs was (77.69±15.24cGy) to large colon, (93.079±12.31cGy) to right kidney (80.688±12.644cGy) to skin, (155.86±17.69cGy) to small bowel. This was more significant value noted. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=radiation%20dose" title="radiation dose">radiation dose</a>, <a href="https://publications.waset.org/abstracts/search?q=cervical%20carcinoma" title=" cervical carcinoma"> cervical carcinoma</a>, <a href="https://publications.waset.org/abstracts/search?q=day%E2%80%99s%20methods" title=" day’s methods"> day’s methods</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20medicine" title=" radiation medicine"> radiation medicine</a> </p> <a href="https://publications.waset.org/abstracts/6291/calculation-of-organs-radiation-dose-in-cervical-carcinoma-external-irradiation-beam-using-days-methods" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/6291.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">419</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">1548</span> Uncertainty of the Brazilian Earth System Model for Solar Radiation </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Elison%20Eduardo%20Jardim%20Bierhals">Elison Eduardo Jardim Bierhals</a>, <a href="https://publications.waset.org/abstracts/search?q=Claudineia%20Brazil"> Claudineia Brazil</a>, <a href="https://publications.waset.org/abstracts/search?q=Deivid%20Pires"> Deivid Pires</a>, <a href="https://publications.waset.org/abstracts/search?q=Rafael%20Haag"> Rafael Haag</a>, <a href="https://publications.waset.org/abstracts/search?q=Elton%20Gimenez%20Rossini"> Elton Gimenez Rossini</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study evaluated the uncertainties involved in the solar radiation projections generated by the Brazilian Earth System Model (BESM) of the Weather and Climate Prediction Center (CPTEC) belonging to Coupled Model Intercomparison Phase 5 (CMIP5), with the aim of identifying efficiency in the projections for solar radiation of said model and in this way establish the viability of its use. Two different scenarios elaborated by Intergovernmental Panel on Climate Change (IPCC) were evaluated: RCP 4.5 (with more optimistic contour conditions) and 8.5 (with more pessimistic initial conditions). The method used to verify the accuracy of the present model was the Nash coefficient and the Statistical bias, as it better represents these atmospheric patterns. The BESM showed a tendency to overestimate the data of solar radiation projections in most regions of the state of Rio Grande do Sul and through the validation methods adopted by this study, BESM did not present a satisfactory accuracy. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=climate%20changes" title="climate changes">climate changes</a>, <a href="https://publications.waset.org/abstracts/search?q=projections" title=" projections"> projections</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20radiation" title=" solar radiation"> solar radiation</a>, <a href="https://publications.waset.org/abstracts/search?q=uncertainty" title=" uncertainty"> uncertainty</a> </p> <a href="https://publications.waset.org/abstracts/98489/uncertainty-of-the-brazilian-earth-system-model-for-solar-radiation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/98489.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">250</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">1547</span> A Survey on the Sun Tracking Systems and Its Principle for Getting Maximum Sun Radiation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Talha%20Ali%20Khan">Talha Ali Khan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Discovering different energy resources to fulfill the world's growing demand is now one of the society’s bigger challenges for the next half-century. The main task is to convert the sun radiation into electricity via photovoltaic solar cells which is suddenly decreasing $/watt of delivered solar electricity. Therefore, in this context the sun trackers are those devices that can be used to ameliorate efficiency. In this paper, a variety of the sun tracking systems are evaluated and their merits and demerits are highlighted. The most adept and proficient sun-tracking devices are polar axis and azimuth-elevation types. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dual%20axis" title="dual axis">dual axis</a>, <a href="https://publications.waset.org/abstracts/search?q=fixed%20axis" title=" fixed axis"> fixed axis</a>, <a href="https://publications.waset.org/abstracts/search?q=sun%20tracker" title=" sun tracker"> sun tracker</a>, <a href="https://publications.waset.org/abstracts/search?q=sun%20radiation" title=" sun radiation"> sun radiation</a> </p> <a href="https://publications.waset.org/abstracts/6802/a-survey-on-the-sun-tracking-systems-and-its-principle-for-getting-maximum-sun-radiation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/6802.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">454</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">1546</span> Monte Carlo Simulation of Thyroid Phantom Imaging Using Geant4-GATE</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Parimalah%20Velo">Parimalah Velo</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmad%20Zakaria"> Ahmad Zakaria</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Introduction: Monte Carlo simulations of preclinical imaging systems allow opportunity to enable new research that could range from designing hardware up to discovery of new imaging application. The simulation system which could accurately model an imaging modality provides a platform for imaging developments that might be inconvenient in physical experiment systems due to the expense, unnecessary radiation exposures and technological difficulties. The aim of present study is to validate the Monte Carlo simulation of thyroid phantom imaging using Geant4-GATE for Siemen’s e-cam single head gamma camera. Upon the validation of the gamma camera simulation model by comparing physical characteristic such as energy resolution, spatial resolution, sensitivity, and dead time, the GATE simulation of thyroid phantom imaging is carried out. Methods: A thyroid phantom is defined geometrically which comprises of 2 lobes with 80mm in diameter, 1 hot spot, and 3 cold spots. This geometry accurately resembling the actual dimensions of thyroid phantom. A planar image of 500k counts with 128x128 matrix size was acquired using simulation model and in actual experimental setup. Upon image acquisition, quantitative image analysis was performed by investigating the total number of counts in image, the contrast of the image, radioactivity distributions on image and the dimension of hot spot. Algorithm for each quantification is described in detail. The difference in estimated and actual values for both simulation and experimental setup is analyzed for radioactivity distribution and dimension of hot spot. Results: The results show that the difference between contrast level of simulation image and experimental image is within 2%. The difference in the total count between simulation and actual study is 0.4%. The results of activity estimation show that the relative difference between estimated and actual activity for experimental and simulation is 4.62% and 3.03% respectively. The deviation in estimated diameter of hot spot for both simulation and experimental study are similar which is 0.5 pixel. In conclusion, the comparisons show good agreement between the simulation and experimental data. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=gamma%20camera" title="gamma camera">gamma camera</a>, <a href="https://publications.waset.org/abstracts/search?q=Geant4%20application%20of%20tomographic%20emission%20%28GATE%29" title=" Geant4 application of tomographic emission (GATE)"> Geant4 application of tomographic emission (GATE)</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=thyroid%20imaging" title=" thyroid imaging"> thyroid imaging</a> </p> <a href="https://publications.waset.org/abstracts/67186/monte-carlo-simulation-of-thyroid-phantom-imaging-using-geant4-gate" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/67186.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">271</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">1545</span> Improving the Genetic Diversity of Soybean Seeds and Tolerance to Drought Irradiated with Gamma Rays</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Aminah%20Muchdar">Aminah Muchdar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> To increase the genetic diversity of soybean in order to adapt to agroecology in Indonesia conducted ways including introduction, cross, mutation and genetic transformation. The purpose of this research is to obtain early maturity soybean mutant lines, large seed tolerant to drought with high yield potential. This study consisted of two stages: the first is sensitivity of gamma rays carried out in the Laboratory BATAN. The genetic variety used is Anjasmoro. The method seeds irradiated with gamma rays at a rate of activity with the old ci 1046.16976 irradiation 0-71 minutes. Irradiation doses of 0, 100, 200, 300, 400, 500, 600, 700, 800, 900 and 1000gy. The results indicated all seeds irradiated with doses of 0 - 1000gy, just a dose of 200 and 300gy are able to show the percentage of germination, plant height, number of leaves, number of normal sprouts and green leaves of the best and can be continued for a second trial in order to assemble and to get mutants which is expected. The result of second stage of soybean M2 Population irradiated with diversity Gamma Irradiation performed that in the form of soybean planting, the seed planted is the first derivative of the M2 irradiated seeds. The result after the age of 30ADP has already showing growth and development of plants that vary when compared to its parent, both in terms of plant height, number of leaves, leaf shape and leaf forage level. In the generative phase, a plant that has been irradiated 200 and 300 gy seen some plants flower form packs, but not formed pods, there is also a form packs of flowers, but few pods produce soybean morphological characters such as plant height, number of branches, pods, days to flowering, harvesting, seed weight and seed number. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=gamma%20ray" title="gamma ray">gamma ray</a>, <a href="https://publications.waset.org/abstracts/search?q=genetic%20mutation" title=" genetic mutation"> genetic mutation</a>, <a href="https://publications.waset.org/abstracts/search?q=irradiation" title=" irradiation"> irradiation</a>, <a href="https://publications.waset.org/abstracts/search?q=soybean" title=" soybean"> soybean</a> </p> <a href="https://publications.waset.org/abstracts/36185/improving-the-genetic-diversity-of-soybean-seeds-and-tolerance-to-drought-irradiated-with-gamma-rays" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/36185.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">400</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">1544</span> Double Beta Decay Experiments in Novi Sad</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Nata%C5%A1a%20Todorovi%C4%87">Nataša Todorović</a>, <a href="https://publications.waset.org/abstracts/search?q=Jovana%20Nikolov"> Jovana Nikolov</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Despite the great interest in β⁻β⁻ decay, β⁺β⁺ decays are rarely investigated due to the low probability of detecting these processes with available low-level equipment. If β⁺β⁺, β⁺EC, or ECEC decay occurs in a thin sample of a material, the positrons will be stopped and annihilated inside the material, leading to the emission of two or four coincidence gamma photons energy of 511 keV. The paper presents the results of measurements of double beta decay of ⁶⁴Zn, ⁵⁰Cr, and ⁵⁴Fe isotopes. In the first experiment, 511-keV gamma rays originating from the annihilation of positrons in natural zinc were measured by a coincidence technique to obtain a non-zero value for the (0ν+2ν) half-life. In the second experiment, the result of measuring double beta decay of ⁵⁰Cr is presented, which suggests a result other than zero at 95% CL and gives the lowest limit for the half-life of this process. In the third experiment, neutrino-less ECEC decay of ⁵⁴Fe was examined. Under the decay theory, gamma rays are emitted whose energy does not coincide with the energies of gamma rays emitted by nuclei from known discrete excited states. Iron shield of an internal volume of 1 m³ and thickness of 25 cm served as a source for measuring the (0ν+2ν) process in ⁵⁴Fe, whose yield in natural iron is 5.4%. We obtain the lower limit for the half-life for ⁵⁴Fe: T(0ν, K, K)>4.4x10²⁰ yr, T(0ν, K, L)>4.1x10²⁰ yr, and T(0ν, L, L)>5.0x10²⁰ yr. For ⁵⁰Cr limit for the half-life is T(0ν+2ν)>1.3(6)x10¹⁸ yr, and for ⁶⁴Zn T(0ν+2ν, ECβ+)=1.1(0.9)x10⁹ years. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutrinoless%20double%20beta%20decay" title="neutrinoless double beta decay">neutrinoless double beta decay</a>, <a href="https://publications.waset.org/abstracts/search?q=half-life" title=" half-life"> half-life</a>, <a href="https://publications.waset.org/abstracts/search?q=%E2%81%B6%E2%81%B4Zn" title=" ⁶⁴Zn"> ⁶⁴Zn</a>, <a href="https://publications.waset.org/abstracts/search?q=%E2%81%B5%E2%81%B0Cr" title=" ⁵⁰Cr"> ⁵⁰Cr</a>, <a href="https://publications.waset.org/abstracts/search?q=and" title=" and"> and</a>, <a href="https://publications.waset.org/abstracts/search?q=%E2%81%B5%E2%81%B4Fe" title=" ⁵⁴Fe"> ⁵⁴Fe</a> </p> <a href="https://publications.waset.org/abstracts/152564/double-beta-decay-experiments-in-novi-sad" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/152564.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">107</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">1543</span> Vibration of Gamma Graphyne with an Attached Mass</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Win-Jin%20Chang">Win-Jin Chang</a>, <a href="https://publications.waset.org/abstracts/search?q=Haw-Long%20Lee"> Haw-Long Lee</a>, <a href="https://publications.waset.org/abstracts/search?q=Yu-Ching%20Yang"> Yu-Ching Yang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Atomic finite element simulation is applied to investigate the vibration frequency of a single-layer gamma graphyne with an attached mass for the CCCC, SSSS, CFCF, SFSF boundary conditions using the commercial code ANSYS. The fundamental frequencies of the graphyne sheet are compared with the results of the previous study. The results of the comparison are very good in all considered cases. The attached mass causes a shift in the resonant frequency of the graphyne. The frequencies of the single-layer gamma graphyne with an attached mass for different boundary conditions are obtained, and the order based on the boundary condition is CCCC >SSSS > CFCF> SFSF. The highest frequency shift is obtained when the attached mass is located at the center of the graphyne sheet. This is useful for the design of a highly sensitive graphyne-based mass sensor. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=graphyne" title="graphyne">graphyne</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20element%20analysis" title=" finite element analysis"> finite element analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20analysis" title=" vibration analysis"> vibration analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=frequency%20shift" title=" frequency shift"> frequency shift</a> </p> <a href="https://publications.waset.org/abstracts/83663/vibration-of-gamma-graphyne-with-an-attached-mass" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/83663.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">212</span> </span> </div> </div> <ul class="pagination"> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=gamma%20radiation&page=5" rel="prev">&lsaquo;</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=gamma%20radiation&page=1">1</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=gamma%20radiation&page=2">2</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=gamma%20radiation&page=3">3</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=gamma%20radiation&page=4">4</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=gamma%20radiation&page=5">5</a></li> <li class="page-item active"><span class="page-link">6</span></li> <li 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