2017 Fiscal Year Final Research Report
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 |
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| Research Field |
Nuclear engineering
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| Research Institution | Kitasato University (2016-2017)
Institute of Physical and Chemical Research (2014-2015) |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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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 |
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| 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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| Free Research Field |
放射線化学
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