WEKO3
アイテム
MEASUREMENT OF IN-AIR AND IN-WATER ABSORBED DOSES AND QUALITY FACTORS OUTSIDE OF THE IRRADIATION FIELD IN PASSIVE CARBON-ION RADIOTHERAPY
https://repo.qst.go.jp/records/69896
https://repo.qst.go.jp/records/698968f506772-07db-4a6b-80d4-5de843d66249
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2009-10-19 | |||||
| タイトル | ||||||
| タイトル | MEASUREMENT OF IN-AIR AND IN-WATER ABSORBED DOSES AND QUALITY FACTORS OUTSIDE OF THE IRRADIATION FIELD IN PASSIVE CARBON-ION RADIOTHERAPY | |||||
| 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_c94f | |||||
| 資源タイプ | conference object | |||||
| 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 |
Yonai, Shunsuke
× Yonai, Shunsuke× Kase, Yuuki× Matsufuji, Naruhiro× Kanai, Tatsuaki× 米内 俊祐× 加瀬 優紀× 松藤 成弘× 金井 達明 |
|||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The National Institute of Radiological Sciences (NIRS) has extensively studied passive carbon-ion radiotherapy for cancer treatment with some positive outcomes. These successful results allow the patients to live for a longer time and younger patients to receive the radiotherapy. The incidence of secondary malignance as a result of the radiotherapy in these patients is of great concern to us. Especially, the assessment of the secondary neutrons inevitably produced within the patient and beam line devices in the carbon-ion radiotherapy is very important due to the potency of their biological effect. Our previous study showed that the secondary neutron exposure in normal tissues far from the target volume in carbon-ion radiotherapy is lower than that in proton radiotherapy, and is equal to or less than that in photon radiotherapy based on the measurement of the ambient dose equivalents at the patient position. [1] However, it is considered to be non-negligible in the estimation of the secondary cancer risk. Distributions of the absorbed dose and the biological effectiveness in the patient are required for assessing the risk. Such investigations are often performed using Monte Carlo calculations,[2] because it is very difficult to obtain them experimentally. However, the experimental verification of the calculations has to be done for the accurate assessment. In this study, in-air and in-water lineal energy distributions were measured by using a commercial tissue equivalent proportional counter (TEPC) at Heavy Ion Medical Accelerator in Chiba (HIMAC) treatment room. Based on the lineal energy distributions, we could obtain the in-air and in-water absorbed doses and quality factors. TEPC dosimetry can not discriminate the information of neutrons and other radiations when using TEPC only, but can provide biologically relevant information. These measured data should be useful for the secondary cancer risk assessment based on experimental data and the verification of Monte Carlo calculation. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | NEUDOS-11 | |||||
| 発表年月日 | ||||||
| 日付 | 2009-10-16 | |||||
| 日付タイプ | Issued | |||||
