Investigation of LET dependence controller on Fricke gel dosimeter
Project/Area Number |
26820412
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Nuclear engineering
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Research Institution | Kitasato University (2016-2017) Institute of Physical and Chemical Research (2014-2015) |
Principal Investigator |
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Project Period (FY) |
2014-04-01 – 2018-03-31
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Project Status |
Completed (Fiscal Year 2017)
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Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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Keywords | ゲル線量計 / フリッケゲル / ナノクレイ / MRI / 重粒子線 / 線量分布測定 / ナノコンポジットゲル / LET依存性 / フリッケ線量計 / 三次元線量分布 / LET効果 / 重粒子線治療 / 放射線化学 / 水溶液線量計 |
Outline of Final Research Achievements |
We report a nanocomposite Fricke gel (NC-FG) dosimeter prepared using only Fe2+ and nanoclay in water, without any organic gelling agents. This dosimeter gels due to its thixotropic properties and exhibits linear energy transfer (LET)-independent radiological properties under carbon ion beam irradiation. The radiation sensitivity of this dosimeter was three times higher than that reported previously for a similar dosimeter containing gelatin. A further increase in the radiation sensitivity was observed upon addition of the hydrated electron scavenger N2O, suggesting the reduction of Fe3+ by a hydrated electron. LET-dependent variations of the contributions of OH radicals and hydrated electrons compensate each other in the oxidation yield of NC-FG. This is the main mechanism of the suppression of LET effcts in the Bragg peak compared to conventional Fricke dosimeters.
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Report
(5 results)
Research Products
(27 results)
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[Presentation] LET依存性のないゲル線量計の開発2015
Author(s)
前山拓哉 福西暢尚 石川顕一 深作和明 福田茂一
Organizer
平成26年度 HIMAC共同利用研究 成果発表会
Place of Presentation
ホテルポートプラザちば(千葉)
Year and Date
2015-04-21
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[Presentation] LET依存性のないゲル線量計の開発2014
Author(s)
前山 拓哉, 福西 暢尚, 石川 顕一, 古田 琢哉, 深作 和明, 高木 周, 野田 茂穂, 姫野 龍太郎, 福田茂一
Organizer
平成25年度HIMAC 共同利用研究成果発表会
Place of Presentation
千葉
Year and Date
2014-04-22
Related Report
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[Patent(Industrial Property Rights)] 放射線線量測定ゲル、及びそれを放射線線量の計測材料として備える放射線線量計2014
Inventor(s)
前山拓哉,福西暢尚,石川顕一,石田康博,相田卓三,深作和明,工藤
Industrial Property Rights Holder
前山拓哉,福西暢尚,石川顕一,石田康博,相田卓三,深作和明,工藤
Industrial Property Rights Type
特許
Industrial Property Number
2014-257836
Filing Date
2014-12-19
Related Report