利用锶特效树脂和正比计数器同时快速分析89Sr和90Sr

本文建立了利用锶特效树脂分离后采用正比计数器进行2次测量从而同时并快速获得⁸⁹Sr和⁹⁰Sr含量的方法，研究了⁹⁰Y的生长因子及⁸⁹Sr/⁹⁰Sr活度比对⁸⁹Sr和⁹⁰Sr测量结果的影响。结果表明，增大⁹⁰Y的生长因子，更有利于准确获得⁸⁹Sr和⁹⁰Sr的活度。将本方法应用于⁸⁹Sr/⁹⁰Sr活度比为0.22～21.8样品中⁸⁹Sr和⁹⁰Sr的分析，测量值与掺标值的相对偏差小于±30%；不确定度分析表明，一个核素的不确定度将随另一核素活度比或活度的增加而增加。IAEA能力验证样品的分析结果显示，⁸⁹Sr和⁹⁰Sr测量值与指定值的相对偏差最大为7.44%，证实了本方法的准确性。

Simultaneous and Rapid Analysis of 89Sr and90Sr by Sr Specific Resin and Proportional Counter

In this paper, a simultaneous and rapid analysis method of 89Sr and⁹⁰Sr was established by proportional counter to measure twice after separation using Sr specific resin. The effects of⁹⁰Y growth factor and⁸⁹Sr/⁹⁰Sr activity ratio on the measured values of 89Sr and⁹⁰Sr were studied. The results show that increasing ⁹⁰Y growth factor is more conducive to obtain the activities of⁸⁹Sr and⁹⁰Sr. This method was applied to the analysis of⁸⁹Sr and ⁹⁰Sr in samples with⁸⁹Sr/⁹⁰Sr activity ratio ranging from 0.22 to 21.8, and the relative deviation between the measured value and the standard value is less than ±30%. The uncertainty analysis shows that the uncertainty of one nuclide will increase with activity ratio or activity of another nuclide. The maximum relative deviation of⁸⁹Sr and⁹⁰Sr between the measured value and the standard value is 7.44%, which proves the accuracy of this method by the analysis of IAEA proficiency test samples.