| Project/Area Number |
22510057
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Risk sciences of radiation/Chemicals
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| Research Institution | Kanazawa University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
張 勁 富山大学, 理工学研究部, 教授 (20301822)
佐々木 圭一 金沢学院大学, 文化系, 准教授 (50340021)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 天然放射性核種 / 大深度温鉱泉 / 高塩分地下 / ラジウム / ウラン / NaCl型地下熱水 / 温泉水 / 化石海水 / アルファー反跳 / 大深度掘削泉 / 高NaCl型温泉水 / 北海道 / 放射性核種の挙動 / 高塩分熱水 / 放射性元素の挙動 |
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| Research Abstract |
Radium isotopes (226Ra and 228Ra) were measured for Na-Cl type groundwater samples collected from Hokkaido, Aomori, Akita and Yamagata Prefectures in Japan. The 226Ra contents varied in the wide range from 9 - 5000 mBq kg-1and their values were roughly correlated to the total dissolved solid (TDS). Activity ratios of 228Ra/226Ra in groundwater ranged from 0.3- 4.2 and most of them clustered around those of 232Th/238U of common rocks in Japan. These observations agreed well with the previous results from Ishikawa, Toyama and Niigata Prefectures, and, overall, indicated that Ra was mainly transported into the groundwater by α-recoil process and its concentration in groundwater was constrained by adsorption-desorption reaction depending on salinity.
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