Decontamination and solidification treatment on spent liquid scintillation cocktail

使用済液体シンチレーションカクテルの除染及び固化に関する研究

渡部 創  ; 高畠 容子  ; 小木 浩通*; 大杉 武史  ; 谷口 拓海 ; 佐藤 淳也 ; 新井 剛*; 梶並 昭彦*

Watanabe, So; Takahatake, Yoko; Ogi, Hiromichi*; Osugi, Takeshi; Taniguchi, Takumi; Sato, Junya; Arai, Tsuyoshi*; Kajinami, Akihiko*

Treatment of spent scintillation cocktail generated by analysis of radioactivity is one of important tasks for management of nuclear laboratories. This study proposed a procedure consists of adsorption of radioactivity and solidification of residual liquid wastes, and fundamental performance of each step was experimentally tested. Batch-wise adsorption showed excellent adsorption performance of Ni onto silica-based adsorbent, and chelate reaction was suggested as the adsorption mechanism by EXAFS analysis. Alkaline activate material successfully solidified the liquid waste, and TG/DTA and XRD analyses revealed that the organic compounds exist inside the matrix. Only 1% of the loaded organic compounds were leaked from the matrix by a leaching test, and most of the organic compounds should be stably kept inside the matrix.