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Evaluation of base materials of TL slab Dosimeter for heavy-ion radiotherapy
https://repo.qst.go.jp/records/71384
https://repo.qst.go.jp/records/7138495e84185-a85f-488f-8579-41e5b3bfd6d5
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2013-12-03 | |||||
| タイトル | ||||||
| タイトル | Evaluation of base materials of TL slab Dosimeter for heavy-ion radiotherapy | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 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 |
古場, 裕介
× 古場, 裕介× 眞正, 浄光× 玉津, 早駿× 福田, 茂一× 若林, 源一郎× 古場 裕介× 眞正 浄光× 玉津 早駿× 福田 茂一× 若林 源一郎 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In order to measure a three-dimensional dose distribution in X-ray radiotherapy, we developed TL slab dosimeter with new TL phosphor Li3B7O12(Cu), which has Zeff = 7.42 and a density of 1.01 g/cm3 and synthetic resin as binder. We can measure a 3D dose distribution easily and reliably using this detector. This detector showed a promising tool for QA/QC in advanced X-ray radiotherapies such as IMRT etc. In heavy-ion radiotherapies which shape precipitous dose distributions, it is also necessary to measure 3D dose distribution easily. To use TL slab dosimeter in heavy-ion dosimetry, it is essential to measure its LET dependence sufficiently. And it is necessary to evaluate the dosimetric water equivalence of this dosimeter for heavy ions. Previous studies showed that the relative TL efficiency of this TL phosphor decreased to about 20% at the Bragg-peak of carbon 290 MeV/u beams and the stopping-power ratio of this dosimeter to water for carbon ions was 0.87. These results were not good for application in heavy-ion radiotherapy. It was often reported that there is a relationship between the glow curve shape of general TLDs (such as LiF and BeO) and LET. Using this relationship of glow curve and LET, the relative TL efficiency can be corrected and we could apply TLDs to dose measurement in heavy-ion radiotherapies. In this study, in order to develop better TL slab dosimeter for heavy-ion radiotherapy using TL phosphors with the above characteristics, we evaluated the dosimetric water equivalence of several base materials for TL slab dosimeter. We chose several kinds of ceramics with heating resistance as the base material. We focused attention on stopping power, scattering power and nuclear cross section of these materials for heavy ions. We calculated these interactions using the Bethe formula, the Gottschalk formula and the Sihver formula. On the basis this evaluation we will develop the TL slab dosimeter for heavy-ion radiotherapy. Key words: TLD, TL slab dosimeter, heavy-ion radiotherapy |
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| 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 | HITSRS2013 | |||||
| 発表年月日 | ||||||
| 日付 | 2013-05-15 | |||||
| 日付タイプ | Issued | |||||
