2021 年 56 巻 4 号 p. 280-287
Strontium-90 (90Sr) is an important radionuclide for understanding the effects of nuclear-related facilities on the surrounding environment, however the conventional method for determination of 90Sr is complicated and time consuming. Therefore, we examined a rapid determination method for separation and purification of Y from agricultural and livestock products, indicator plants by means of solid-phase extraction with DGA resin. The resin is then used to determine 90Sr by detection of yttrium-90 (90Y), which exists in secular equilibrium with 90Sr. The method was tested on 90Sr-spiked samples (milk) and a certified reference material (IAEA-330), and the trueness values were 108% and 107% for milk, 111% for IAEA-330. In addition, stable Y recoveries exceeded 0.81 in the tests. The ratio of values measured by our examined method and the conventional method ranged from 0.75 to 1.15, and the 90Sr detection limit ranged from 0.02 to 0.05 Bq/kg fresh weight. The sample-throughput time for the examined method was approximately 3 weeks shorter than that of the conventional method.
