| Project/Area Number |
17K00545
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Risk sciences of radiation and chemicals
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| Research Institution | Fukushima University |
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Principal Investigator |
Takase Tsugiko 福島大学, 共生システム理工学類, 特任准教授 (10466641)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2019: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 放射性セシウム / 構造解析 / 計算化学 / 量子化学シミュレーション / 粘土鉱物 / 吸着状態 / 鉱物の局所構造 |
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| Outline of Final Research Achievements |
In this study, we targeted on the fine particles containing radioactive Cs collected from the surface of the FDNPP area. The local area in the particles were analyzed using a local structure analysis system consisting of Focused Ion Beam machine (FIB) and Scanning transmission Electron microscope (STEM: Energy dispersive X-ray analyzer was built in STEM).
It was clarified that weathered biotite particles containing radioactive Cs are heterogeneous structures in which biotite-like and vermiculite-like structures are mixed. In addition, by modeling the structural characteristics of particles and performing simulations based on computational chemistry, It was suggested radioactive Cs ion is adsorbed to K-ion site in weathered biotite particles, which stabilizes Cs ion in the particles.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，福島第一原子力発電所近郊で採取した放射性Csを含む土壌粒子の微視的な構造解析を行い，構造解析データに基づく量子化学シミュレーションと融合することにより，土壌粒子の「biotite-likeとVermiculite-likeな構造が混在したheterogeneousな構造」が放射性Csの吸着に大きな影響を及ぼすことを明らかにし，福島原発事故によって大気中に放出された放射性Csの吸着過程に関する新たな知見を得ることができた．
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