核电站液态流出物中^(63)Ni的快速分离与测定

Rapid separation and determination of ^(63)Ni in liquid effluents of NPP

本文通过系统调研,以Ni特效树脂为^(63)Ni分离富集材料、低本底液闪谱仪为测量仪器,经过大量条件实验进行方法优化,建立了一套核电站液态流出物中^(63)Ni的快速分析方法。本方法取样量小,6个平行样品的化学回收率为(93.2±3.6)%,放化回收率为(92.1±2.8)%,探测限为67.4 mBq/L,对干扰核素去污因子高,其中对Fe、Co、Zn、Mn的去污因子分别为10^(2)、10^(4)、10^(2)及10^(4),分析周期短(约9 h):同时使用建立的方法进行了液态流出物样品的分析,证明本方法可应用于核电站液态流出物的快速监测,并发现不同类型反应堆运行时液态流出物中^(63)Ni的浓度可能会存在较大差异。

In this study,a rapid analysis method of ^(63)Ni in liquid effluents of a NPP was established by systematic investigation,using Ni specific resin as the separation and enrichment material,and low background liquid scintillation spectrometer as the measuring instrument.The recovery rate of six parallel samples was(93.2±3.6)%,and the radiochemical recovery rate was(92.1±2.8)%.The detection limit is 67.4 mBq/L,and the decontamination factors of Fe,Co,Zn and Mn are 10^(2),10^(4),10^(2) and 10^(4),respectively.The analysis period is short(less than 24 h).At the same time,the liquid effluent samples are analyzed by the established method,which proves that the method can be applied to the rapid monitoring of liquid effluents in NPP,It is found that the concentration of ^(63)Ni in liquid effluents of different types of reactors may be different.