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Secondary neutron dose in carbon-ion radiotherapy: investigations in QST-NIRS
https://repo.qst.go.jp/records/84334
https://repo.qst.go.jp/records/843340d0e7d1e-c82d-4ee8-b183-dfb51ce26c93
| Item type | 一般雑誌記事 / Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2021-02-10 | |||||
| タイトル | ||||||
| タイトル | Secondary neutron dose in carbon-ion radiotherapy: investigations in QST-NIRS | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Shunsuke, Yonai
× Shunsuke, Yonai× Shinnosuke, Matsumoto× Shunsuke, Yonai× Shinnosuke, Matsumoto |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Background: The National Institutes for Quantum and Radiological Science and Technology–National Institute of Radiological Sciences (QST–NIRS) has continuously investigated the undesired radiation exposure in ion beam radiotherapy mainly in carbon-ion radiotherapy (CIRT). This review introduces our investigations on the secondary neutron dose in CIRT with the broad and scanning beam methods. Materials and methods: The neutron ambient dose equivalents in CIRT are evaluated based on rem meter (WENDI-II) measurements. The out-of-field organ doses assuming prostate cancer and pediatric brain tumor treatments are also evaluated through the Monte Carlo simulation. This evaluation of the out-of-field dose includes contributions from secondary neutrons and secondary charged particles. Results and discussion: The measurements of the neutron ambient dose equivalents at a 90° angle to the beam axis in CIRT with the broad beam method show that the neutron dose per treatment dose in CIRT is lower than that in proton radiotherapy (PRT). For the scanning beam with the energy scanning technique, the neutron dose per treatment dose in CIRT is lower than that in PRT. Moreover, the out-of-field organ doses in CIRT decreased with distance to the target and are less than the lower bound in IMRT shown in AAPM TG-158. Conclusion: The evaluation of the out-of-field doses is important from the viewpoint of secondary cancer risk after radiotherapy. Secondary neutrons are the major source in CIRT, especially in the distant area from the target volume. However, the dose level in CIRT is similar or lower than that in PRT and IMRT, even if the contributions from all radiation species are included in the evaluation. | |||||
| 書誌情報 |
Journal of Radiation Protection and Research 巻 46, 号 2, p. 39-47, 発行日 2021-06 |
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| 出版者 | ||||||
| 出版者 | The Korean Association for Radiation Protection | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 2508-1888 | |||||
