Study on material/seawater circulation in the Japan Sea using environmental radionuclides
| Project/Area Number |
23710008
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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 |
Environmental dynamic analysis
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| Research Institution | Hiroshima University |
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Principal Investigator |
SAKAGUCHI Aya 広島大学, 理学(系)研究科(研究院), 准教授 (00526254)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | ウラン同位体 / 海水循環 / 人工放射性核種 / 日本海 / トレーサー / セシウム / 加速器質量分析 / U-236 / グローバルフォールアウト / 海洋循環トレーサー / Cs-137 |
|---|
| Research Abstract |
We analysed 236U concentration and distribution as well as its chemical state in samples obtained from the Sea of Japan and its surroundings to establish 236U as new oceanographic tracer. 236U concentration in all samples were determined with high precision, which made clear that much smaller samples are sufficient. Our results show that the main source of 236U in the Sea of Japan is direct inflow through Tsushima-strait and that 236U stays in dissolved form in the water column. The depth profile of 236U as well as the diffusion coefficient were found to be similar to the ones of 137Cs, which was widely used as an oceanographic tracer isotope in former research. This suggests that the long-lived anthropogenic radionuclide 236U has a huge potential to replace the short-lived 137Cs as oceanographic tracer. Furthermore, the distributions of 236U suggested a possibility of deep-water formation with the subduction of surface water.
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Report
(4 results)
Research Products
(72 results)
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[Journal Article] An early survey of the radioactive contamination of soil due to the Fukushima Dai-ichi Nuclear Power Plant accident, with emphasis on plutonium analysis2012
Author(s)
M. Yamamoto, T. Takada, S. Nagao, T. Koike, K. Shimada, M. Hoshi, K. Zhumadilov, T. Shima, M. Fukuoka, T. Imanaka, A. Sakaguchi, S. Kimura
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Journal Title
Geochemical Journal
Volume: 46
Pages: 341-353
Related Report
Peer Reviewed
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[Journal Article] Vertical Profiles of Iodine-131 and Cesium-137 in Soils in Fukushima Prefecture related to the Fukushima Daiichi Nuclear Power Station Accident2012
Author(s)
Tanaka, K., Takahashi, Y., Sakaguchi, A., Umeo, M., Hayakawa, S., Tanida, H., Saito, T. ,Kanai, Y
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Journal Title
Geochemical Journal
Volume: 46
Pages: 73-76
NAID
Related Report
Peer Reviewed
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[Presentation] 放射能と放射線2013
Author(s)
坂口綾
Organizer
2013年日本地球化学会若手シンポジウム
Place of Presentation
草加
Year and Date
2013-09-13
Related Report
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[Presentation] Preliminary results on soil core samples collected from the under-floors of houses built within 1-4 years after the Hiroshima Atomic Bomb2012
Author(s)
Sakaguchi, A., Chiga, H., Steier, P., Shizuma, K., Hoshi, M., Takahashi, Y., Yamamoto, M.
Organizer
17th Hiroshima International Symposium, Lessons from unhappy events in the history of nuclear power development
Place of Presentation
Hiroshima
Related Report
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[Presentation] Study on "Black-rain" after the Hiroshima atomic bomb-Reconstruction of close-in fallout deposition-2011
Author(s)
Chiga, H., Sakaguchi, A., Steier, P., Shizuma, K. Hoshi, M., Takahashi, Y., Yamamoto, M
Organizer
4th East Asian Symposium on Accelerator Mass Spectrometry
Place of Presentation
Tokyo
Related Report
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