Estimation of neutron and gamma radiation doses inside the concrete shield wall for 10 and 15 MV medical linear accelerators
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- Fujibuchi Toshioh
- Ibaraki Prefectural University of Health Sciences
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- Obara Satoshi
- National Institute of Radiological Sciences
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- Nakajima Masaru
- Center Institute Hospital, Japanese Foundation for Cancer Research
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- Kitaura Nozomi
- Center Institute Hospital, Japanese Foundation for Cancer Research
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- Sato Tomoharu
- Center Institute Hospital, Japanese Foundation for Cancer Research
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抄録
High-energy electron linear accelerators (linacs) are used in radiotherapy for tumor treatment. By operating at electron energies above the thresholds of the (γ, n) photonuclear reaction, undesirable photoneutrons and radioisotopes are generated by high-energy x-rays. These photonuclear reactions occur on the linac accelerator head components, which are made from various materials. In these reactions, one can assume that secondary neutrons are dispersed all over the treatment rooms. The present work observed ambient dose equivalent of photon and neutron, and number of etch pits of wide-energy range Neupit produced by thermal and fast neutrons inside a model of iron shielding wall. The neutron dose around the surface of the shielding wall was detected less than three orders of magnitude of photons at 10 MV linac. The total neutron dose in a 15 MV linac was about one order higher than that in the 10 MV linac. In addition, the 15 MV linac incident photons clearly generated secondary neutrons inside the iron shielding wall.
収録刊行物
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- Progress in Nuclear Science and Technology
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Progress in Nuclear Science and Technology 4 280-284, 2014
Atomic Energy Society of Japan
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詳細情報 詳細情報について
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- CRID
- 1390006750773989376
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- NII論文ID
- 40020092273
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- NII書誌ID
- AA12785802
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- NDL書誌ID
- 025518423
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- ISSN
- 21854823
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
