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Angular distributions of absorbed dose of Bremsstrahlung and secondary electrons induced by 18-, 28- and 38-MeV electron beams in thick targets

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Title: Angular distributions of absorbed dose of Bremsstrahlung and secondary electrons induced by 18-, 28- and 38-MeV electron beams in thick targets
Authors: Takada, Masashi Browse this author
Kosako, Kazuaki Browse this author
Oishi, Koji Browse this author
Nakamura, Takashi Browse this author
Sato, Kouichi Browse this author
Kamiyama, Takashi Browse this author
Kiyanagi, Yoshiaki Browse this author →KAKEN DB
Issue Date: Mar-2013
Publisher: Oxford University Press
Journal Title: Radiation Protection Dosimetry
Volume: 153
Issue: 3
Start Page: 369
End Page: 383
Publisher DOI: 10.1093/rpd/ncs114
Abstract: Angular distributions of absorbed dose of Bremsstrahlung photons and secondary electrons at a wide range of emission angles from 0 to 135, were experimentally obtained using an ion chamber with a 0.6 cm(3) air volume covered with or without a build-up cap. The Bremsstrahlung photons and electrons were produced by 18-, 28- and 38-MeV electron beams bombarding tungsten, copper, aluminium and carbon targets. The absorbed doses were also calculated from simulated photon and electron energy spectra by multiplying simulated response functions of the ion chambers, simulated with the MCNPX code. Calculated-to-experimental (C/E) dose ratios obtained are from 0.70 to 1.57 for high-Z targets of W and Cu, from 15 to 135 and the C/E range from 0.6 to 1.4 at 0; however, the values of C/E for low-Z targets of Al and C are from 0.5 to 1.8 from 0 to 135. Angular distributions at the forward angles decrease with increasing angles; on the other hand, the angular distributions at the backward angles depend on the target species. The dependences of absorbed doses on electron energy and target thickness were compared between the measured and simulated results. The attenuation profiles of absorbed doses of Bremsstrahlung beams at 0, 30 and 135 were also measured.
Rights: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Radiation Protection Dosimetry following peer review. The definitive publisher-authenticated version Angular distributions of absorbed dose of Bremsstrahlung and secondary electrons induced by 18-, 28- and 38-MeV electron beams in thick targets is available online at: http://rpd.oxfordjournals.org/content/153/3/369.full.
Type: article (author version)
URI: http://hdl.handle.net/2115/54776
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鬼柳 善明

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