| Project/Area Number |
26630488
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Nuclear engineering
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
Baba Yuji 国立研究開発法人日本原子力研究開発機構, 福島研究開発部門 福島事業管理部, 嘱託 (90360403)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMOYAMA Iwao 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 研究主幹 (10425572)
HIRAO Norie 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 量子ビーム応用研究センター, 技術開発協力員 (30600027)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | セシウム / アルカリ金属 / 吸着 / X線光電子分光法 / 全反射 / 放射光 / Ｘ線光電子分光法 / 酸化物 / 極微量 |
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| Outline of Final Research Achievements |
In order to elucidate chemical states of radioactive cesium adsorbed on soil and clay, X-ray photoelectron spectra (XPS) were measured for ultra-trace cesium and the other alkali metals adsorbed on oxides and layered oxides (mica). When X-ray was irradiated under total reflection condition, ultra-trace level cesium down to 100 pg/cm2 corresponding to 200 Bq of Cs-137 could be measured by XPS. Core-level chemical shifts in XPS spectra for alkali metals adsorbed on mica were analyzed on the basis of a point-charge model. As a result, it was elucidated that chemical bonds between alkali metals and mica become ionic with the decrease in the thickness of the adsorbed layer.
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