An analytical method with a liquid scintillation counting technique for the determination of 90Sr in the presence of other elements was developed by deriving a calculation formula to remove their influences. The analysis of 90Sr has been performed using the radioactive equilibrium of a generation process of 90Y with 90Sr separated from a sample. In this study, a new disintegration calculating formula that enable us to remove the influences by the coexistence nuclides to analyze 90Sr in highly radioactive liquid wastes of spent-fuel reprocessing plants was derived, and the formula was validated by experimental approaches. It was found that 90Sr could be analyzed without any influences when a sample contained nuclides that had a long half life, and the radioactive equilibrium was small enough compared to the generation of 90Y. The relative standard deviation of the analysis by the proposed method was equal to, or less than, 3%.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry