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~(90)Sr-~(90)Y是重要的裂变产物之一。由于它的裂变产额较高,半衰期较长,所以目前它在同位素工业中应用很广泛。~(90)Sr-~(90)Y的生物毒性也很大,所以在核燃料后处理时,从核防护和环境安全出发,人们对~(90)Sr-~(90)Y核素的放射性活度非常关注。本工作研究的目的主要是为同位素工业应用和核燃料后处理厂提供~(90)Sr-~(90)Y放射性活度标准。测量的方法是把~(60)Co作为示踪体,用效率示踪技术测定~(90)Sr-~(90)Y放射性溶液的活度。测量的总不确定度大约为±1.4％。
~ (90) Sr- ~ (90) Y is one of the important fission products. Due to its high fission yield and long half-life, it is now widely used in isotope industries. The bioavailability of ~ (90) Sr- ~ (90) Y is also high, so in the post-treatment of nuclear fuel, the radioactivity of ~ (90) Sr- ~ Activity is very concerned. The purpose of this work is to provide ~ (90) Sr- ~ (90) Y radioactivity standards for isotopic industrial applications and nuclear fuel reprocessing plants. The measurement method is to use ~ (60) Co as a tracer to measure the activity of ~ (90) Sr- ~ (90) Y radioactive solution by efficiency tracing technique. The total uncertainty of the measurement is about ± 1.4%.