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コロイド-岩石-水溶液間での核種の分配; 試験系構築とCsへの適用

Distribution of RN between colloid, rock and aqueous phases; Development of experimental system and application to Cs

中田 弘太郎*; 飯島 和毅; 戸村 努*; 飛田 実*

Nakata, Kotaro*; Iijima, Kazuki; Tomura, Tsutomu*; Tobita, Minoru*

岩石-コロイド-水相間の核種の分配を評価するための試験装置を作製し、スメクタイトコロイド・花崗岩へのCsの収着・脱離・分配試験を行った。装置の試験条件下での適用性を確認し、3相共存系における分配係数を取得した。さらに脱離試験の結果から、スメクタイトコロイドへのCsの収着は可逆的である可能性が高いことを示した。

In this study, a new experimental system has been developed to obtain the information on distribution of raidonuclide between aqueous, colloid and rock phases. Sorption, desorption and distribution experiments of Cs on smectite colloid and granite were carried out with new developed system. After confirmation of applicability of the developed system, Kd values were obtained in 3 phases coexist system. The results of desorption experiment indicated sorption of Cs on smectite colloid is reversible.

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