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Investigation on diffusion of $$^{137}$$Cs$$^{+}$$, $$^{125}$$I$$^{-}$$ and HTO in compacted Ca-montmorillonite by experimental and modelling approaches

圧縮Ca型モンモリロナイト中の$$^{137}$$Cs$$^{+}$$, $$^{125}$$I$$^{-}$$及びHTOの拡散挙動

深津 勇太  ; 四辻 健治*; 大窪 貴洋*; 舘 幸男  

Fukatsu, Yuta; Yotsuji, Kenji*; Okubo, Takahiro*; Tachi, Yukio

A compacted bentonite is an engineered barrier material in the geological disposal of radioactive waste. Na-montmorillonite (Na-MMT), which is main component of the bentonite, might be altered to Ca-montmorillonite (Ca-MMT) due to interaction with cementitious materials used in the geological repository. The alteration of the montmorillonite possibly causes decreasing the barrier performance of compacted bentonite such as a less swelling property and sorption capacity. The diffusion and sorption of various radionuclides were investigated by the integrated sorption and diffusion (ISD) model that we previously developed, as target on compacted Na-MMT. In this study, in order to evaluate influence of the alteration from Na-MMT to Ca-MMT on diffusion of radionuclides, diffusion behaviors of $$^{137}$$Cs$$^{+}$$, $$^{125}$$I$$^{-}$$ and HTO in compacted Ca-MMT were investigated by experimental and modelling approaches.

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English

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Clay Conference 2022; 8th International Conference on Clays in Natural and Engineered Barriers for Radioactive Waste Confinement

開催年月

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2022/06

開催都市

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Nancy

開催国

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France

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no keyword

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広報プレスリリース

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論文解説記事
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受委託・共同研究相手機関

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資源エネルギー庁

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