Title: Spectra and air-kerma strength for encapsulated 192Ir sources
Abstract: Medical PhysicsVolume 26, Issue 11 p. 2441-2444 Radiation therapy physics Spectra and air-kerma strength for encapsulated sources Jette Borg, Jette Borg Institute for National Measurement Standards, National Research Council, Ottawa, Ontario K1A 0R6, CanadaSearch for more papers by this authorDavid W. O. Rogers, David W. O. Rogers Institute for National Measurement Standards, National Research Council, Ottawa, Ontario K1A 0R6, CanadaSearch for more papers by this author Jette Borg, Jette Borg Institute for National Measurement Standards, National Research Council, Ottawa, Ontario K1A 0R6, CanadaSearch for more papers by this authorDavid W. O. Rogers, David W. O. Rogers Institute for National Measurement Standards, National Research Council, Ottawa, Ontario K1A 0R6, CanadaSearch for more papers by this author First published: 11 November 1999 https://doi.org/10.1118/1.598763Citations: 64AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract The photon spectra in vacuum around four types of HDR brachytherapy sources are calculated using the Monte Carlo code EGS4 and the most recent spectral information on decay. The air-kerma strengths per unit activity are calculated based on the photon fluence around a bare source and around each of four types of encapsulated sources using recent mass energy-absorption coefficients. For the full spectrum the bare vs encapsulated difference is up to 23% due to the large air-kerma contribution from the unfiltered low-energy photons. For the penetrating part of the photon spectrum (>11.3 keV), the air-kerma strength per unit source activity on the transverse axis for a bare source is 2–15 % higher than for the encapsulated sources due to the attenuation and absorption in the core and the encapsulating material. The contribution to the air-kerma strength from photons scattered in the capsule and from bremsstrahlung are calculated to increase the air-kerma strength by 2–4% and 0.2–0.3%, respectively. Air-kerma strengths for a variety of sources agree well with previously reported results for sources from Nucletron International, Best Industries, Inc., and Alpha-Omega Services, Inc. In addition we present air-kerma strengths for the present model of the HDR source from Nucletron International and the source from Varian Associates, Inc. Citing Literature Volume26, Issue11November 1999Pages 2441-2444 RelatedInformation
Publication Year: 1999
Publication Date: 1999-11-01
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
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Cited By Count: 76
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