摘要
建立了放射性废物水泥固化体浸出液中55Fe的分析测量方法。先用NaOH共沉淀水泥固化体中的55Fe,再用PAX-2阴离子交换树脂分离纯化,纯化后的55Fe用液体闪烁计数器测量。讨论了PAX-2树脂的最优纯化条件,选择了10.0 mol/L和6.0 mol/L HCl淋洗树脂去除干扰元素。此外,在上述条件下,55Fe的干扰元素Ni、Mn、Cr的去污因子高于10000,Co和Zn的去污因子分别可达769和629。采用一系列水泥浸出液样品标记比活度为16~39 Bq/g的标准55Fe及空白样品进行验证,结果表明:55Fe的平均回收率为76%±2%,测量1 h的最低探测限为0.018 Bq/g。
A method for determination of 55Fe in leaching solution of cement solidification using PAX-2 anion exchange resin was developed.In this work,55Fe was first precipitated in the form of hydroxide and subsequently purified by PAX-2 anion exchange resin.After the purification,55Fe was determined by liquid scintillation counter(LSC).The optimal purification condition of PAX-2 anion resin was discussed,and 10.0 mol/L,6.0 mol/L HCl were chosen.In addition,the decontamination factors for 55Fe with Ni,Mn and Cr are higher than 10000,while the decontamination factors of Co and Zn are 769 and 629,respectively.The performance of the method was examined using a series of the leaching solution samples spiked with various specific activities of 55Fe ranging from 16-39 Bq/g,along with the procedural blanks.The mean chemical recovery of 55Fe is 76%±2%.The minimum detectable specific activity is determined to be 0.018 Bq/g for 55Fe in leaching solution samples with a counting time of 1 h.
作者
马莉娜
宋丽娟
戴雄新
MA Li-na;SONG Li-juan;DAI Xiong-xin(China Institute for Radiation Protection,Taiyuan 030006,China)
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2021年第1期81-86,I0003,共7页
Journal of Nuclear and Radiochemistry
