核电厂废树脂中^(90)Sr、^(55)Fe含量的快速分析

Rapid Analysis of ^(90)Sr and ^(55)Fe in Spent Ion-exchange Resin of NPP

随着我国核电机组不断投入运行,会产生大量的放射性废树脂,废树脂中含有的中、长半衰期放射性核素关系到处置场的长期安全性,是处置场安全评价的重点。本工作利用萃取色层法和低本底液闪测量法建立了一种核电厂废树脂中^(90)Sr和^(55)Fe快速分析方法,该方法Sr的化学回收率为94.94%,最小可探测比活度为5.51 Bq/kg,采用两种分离方法Fe的化学回收率分别为96.60%、87.23%,最小可探测比活度分别为10.83、11.76 Bq/kg。

As a growing number of nuclear power units are putting into operation in China,a large amount of radioactive spent ion-exchange resin will be produced.The medium and long half-life radionuclides contained in spent ion-exchange resin are the focus of the safety assessment of disposal site,since they are critical to the long-term safety of disposal site.In this paper extraction chromatography and low background liquid scintillation spectrometry were adopted to establish a method for rapid analysis of ^(90)Sr and ^(55)Fe in the spent ion-exchange resins of NPP.The results show that the chemical recovery of Sr in this method is 94.94%,and the minimum detectable activity(MDA)is 5.51 Bq/kg,the chemical recovery of Fe using the two separation methods are 96.60%and 87.23%,and the MDA is 10.83 Bq/kg and 11.76 Bq/kg.