Energy Deposited by Secondary Electrons Generated by Swift Proton Beams through Polymethylmethacrylate

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Electrons Generated by Swift Proton Beams through Polymethylmethacrylate</title> <meta name="description" content="Energy Deposited by Secondary Electrons Generated by Swift Proton Beams through Polymethylmethacrylate"> <meta name="keywords" content="Monte Carlo method, secondary electrons, energetic ions, ion-beam cancer therapy, ionization cross section, polymethylmethacrylate, proton beams, secondary electrons, radial energy distribution."> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <meta name="citation_title" content="Energy Deposited by Secondary Electrons Generated by Swift Proton Beams through Polymethylmethacrylate"> <meta name="citation_author" content="Maurizio Dapor"> <meta name="citation_author" content="Isabel Abril"> <meta name="citation_author" content="Pablo de Vera"> <meta name="citation_author" content="Rafael Garcia-Molina"> <meta name="citation_publication_date" 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Secondary Electrons Generated by Swift Proton Beams through Polymethylmethacrylate</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/search?q=Maurizio%20Dapor">Maurizio Dapor</a>, <a href="https://publications.waset.org/search?q=Isabel%20Abril"> Isabel Abril</a>, <a href="https://publications.waset.org/search?q=Pablo%20de%20Vera"> Pablo de Vera</a>, <a href="https://publications.waset.org/search?q=Rafael%20Garcia-Molina"> Rafael Garcia-Molina</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The ionization yield of ion tracks in polymers and bio-molecular systems reaches a maximum, known as the Bragg peak, close to the end of the ion trajectories. Along the path of the ions through the materials, many electrons are generated, which produce a cascade of further ionizations and, consequently, a shower of secondary electrons. Among these, very low energy secondary electrons can produce damage in the biomolecules by dissociative electron attachment. This work deals with the calculation of the energy distribution of electrons produced by protons in a sample of polymethylmethacrylate (PMMA), a material that is used as a phantom for living tissues in hadron therapy. PMMA is also of relevance for microelectronics in CMOS technologies and as a photoresist mask in electron beam lithography. We present a Monte Carlo code that, starting from a realistic description of the energy distribution of the electrons ejected by protons moving through PMMA, simulates the entire cascade of generated secondary electrons. By following in detail the motion of all these electrons, we find the radial distribution of the energy that they deposit in PMMA for several initial proton energies characteristic of the Bragg peak. <iframe src="https://publications.waset.org/10005139.pdf" style="width:100%; height:400px;" frameborder="0"></iframe> <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/search?q=Monte%20Carlo%20method" title="Monte Carlo method">Monte Carlo method</a>, <a href="https://publications.waset.org/search?q=secondary%20electrons" title=" secondary electrons"> secondary electrons</a>, <a href="https://publications.waset.org/search?q=energetic%20ions" title=" energetic ions"> energetic ions</a>, <a href="https://publications.waset.org/search?q=ion-beam%20cancer%20therapy" title=" ion-beam cancer therapy"> ion-beam cancer therapy</a>, <a href="https://publications.waset.org/search?q=ionization%20cross%20section" title=" ionization cross section"> ionization cross section</a>, <a href="https://publications.waset.org/search?q=polymethylmethacrylate" title=" polymethylmethacrylate"> polymethylmethacrylate</a>, <a href="https://publications.waset.org/search?q=proton%20beams" title=" proton beams"> proton beams</a>, <a href="https://publications.waset.org/search?q=secondary%20electrons" title=" secondary electrons"> secondary electrons</a>, <a href="https://publications.waset.org/search?q=radial%20energy%20distribution." title=" radial energy distribution."> radial energy distribution.</a> </p> <p class="card-text"><strong>Digital Object Identifier (DOI):</strong> <a href="https://doi.org/10.5281/zenodo.1125979" target="_blank">doi.org/10.5281/zenodo.1125979</a> </p> <a href="https://publications.waset.org/10005139/energy-deposited-by-secondary-electrons-generated-by-swift-proton-beams-through-polymethylmethacrylate" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/10005139/apa" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">APA</a> <a href="https://publications.waset.org/10005139/bibtex" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">BibTeX</a> <a href="https://publications.waset.org/10005139/chicago" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">Chicago</a> <a href="https://publications.waset.org/10005139/endnote" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">EndNote</a> <a href="https://publications.waset.org/10005139/harvard" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">Harvard</a> <a href="https://publications.waset.org/10005139/json" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">JSON</a> <a href="https://publications.waset.org/10005139/mla" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">MLA</a> <a href="https://publications.waset.org/10005139/ris" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">RIS</a> <a href="https://publications.waset.org/10005139/xml" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">XML</a> <a href="https://publications.waset.org/10005139/iso690" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">ISO 690</a> <a href="https://publications.waset.org/10005139.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">1568</span> </span> <p class="card-text"><strong>References:</strong></p> <br>[1] L. 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Energy Deposited by Secondary Electrons Generated by Swift Proton Beams through Polymethylmethacrylate