Simple determination of Sr in highly radioactive liquid waste by alkaline precipitation separation/liquid scintillation counting technique

Onuma, Takashi; Surugaya, Naoki ; Hiyama, Toshiaki

An analytical method with a liquid scintillation counting technique for the determination of Sr in the presence of other elements was developed by deriving a calculation formula to remove their influence. Generally the analysis of Sr is performed using the radioactive equilibrium of a generation process of Y with Sr separated from a sample. In this study, a new disintegration calculating formula that enable us remove influences by the coexistence nuclides to analyze Sr in highly radioactive liquid wastes of spent-fuel reprocessing plants was derived and the formula was validated by experimental approaches. It was found that Sr was analyzed without any influences when a sample contains nuclides that have a long half life and radioactive equilibrium is small enough compared with a generation of Y. The relative standard deviation of the analysis by the proposed method was equal to or less than 3%.