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微小経路でのアクチニドコロイドの移行に関する研究

Study on migration of actinide colloids through minute paths

鈴木 篤之*; 長崎 晋也*

Suzuki, Atsuyuki*; Nagasaki, Shinya*

高レベル放射性廃棄物処分システムの性能評価を実施する場合、人工バリア中あるいは天然バリア中におけるアクチニド元素の移行挙動の把握が重要となる。近年、特にコロイドを形成したアクチニド元素の挙動の重要性が指摘されてきているが、その挙動に関する知見は十分には得られていない。本研究では、酸化性雰囲気のもと鉄真性コロイドおよびネプツニウム擬似コロイドの石英充填カラム内の移行挙動を検討した。その結果、コロイドの移行成分は、溶離液と同じ速度で移行する成分、遅延する成分、溶離液より速く移行する成分に分けられることがわかった。またそれぞれの移行メカニズムに関する定性的な解釈を加えることができた。

For the safety assessment of high level waste disposal system, it is important to understand the migration behaviors of actinides in the near- or far-field. Although the importance of migration of actinides which form the colloids has been pointed out recently, the migration behaviors of colloids are not fully understood. In this study, the migration behaviors of colloids were investigated experimentally by column method. In the experiments, quartz powder was used as the solid. Ferric hydrous oxide colloids were prepared as the real colloids and neptunium(V) formed Np(V)-Fe(III) pseudocolloids by sorption. Some fractions of the colloids eluted with the eluting solution. Also observed were strongly retarded fractions. Non-negligible fractions were found to migrate faster than the eluting solution. These migration characteristics were qualitatively understood in this work.

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