Simultaneous analysis method of 89Sr and 90Sr in liquid sample using automated separation system

This study described the analytical method for simultaneous determination of Sr-89 and Sr-90 in liquid sample using automated separation system. Radiostrontium in 0.5 kg of liquid sample was concentrated as SrCO3 to reduce the volume of sample, and purified from the sample using Sr-resin 2 mL (BV, Bed volume). The behavior of Sr and interferences such as Ba, Ca and Y were estimated with various flow rate ranging from 1 to 4 mL min(-1). The detailed procedure for the purification of Sr on Sr-resin was presented. The purified radiostronitum was measured in Cerenkov mode and then measured in Scintillation mode by mixing scintillation cocktail. The measured value in both modes were used to calculate the activity of Sr-89 and Sr-90. The performance tests were carried out the lab-control-sample having various activity ratio of between Sr-89 and Sr-90. The recovery of Sr was ranged from 68 to 94 %. The relative bias of Sr-89 activity was ranged from -5 to 20 %, and it was ranged from -10 to 10 % for Sr-90.