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First measurement of $$^{135}$$Cs/$$^{137}$$Cs isotope ratio in Japanese soil before the accident at the Fukushima Daiichi Nuclear Power Station

Shimada, Asako ; Xu, J.*; Tsukahara, Takehiko*; Nomura, Masao*; Takeda, Seiji ; Takahashi, Hiroaki*

Cesium-137 concentration in environmental soil samples near and inside Tokai-mura was exceeded site release standard, 0.1 Bq/g, because of the accident at the Fukushima Daiichi Nuclear Power Station (1F). It is possibly to use the $$^{135}$$Cs/$$^{137}$$Cs isotope ratio to distinguish the $$^{137}$$Cs from the 1F and from decommissioned facility. However, radiocesium from global fallout is also contained in soil and it may be influenced on the $$^{135}$$Cs/$$^{137}$$Cs isotope ratio. There are no data of $$^{135}$$Cs/$$^{137}$$Cs isotope ratio before the 1F accident for soil samples collected in Japan. Therefore, $$^{135}$$Cs/$$^{137}$$Cs isotope ratio in soil samples collected in 2008 y at Tokai-mura was measured to be 2.61$$pm$$0.28 agreed with the result for sampled collected in USA.

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English

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6th International Conference on Radioecology & Environmental Radioactivity (ICRER 2024)

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2024/11

Location (city)

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Marseille

Location (country)

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France

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Keywords

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$$^{135}$$Cs/$$^{137}$$Cs同位体比; 環境放射能; 廃止措置終了確認

Research Facility

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第4研究棟  

Press Release

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JAEA R&D Navigator

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Cooperating Institute

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原子力規制庁; 東京工業大学

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