铀浓度在线分析系统的研制  

Development of Uranium Concentration On-Line Analysis System

作　　者：付建丽[1] 钱红娟[1] 刘焕良[1] 邵少雄[1] 张丽华[1] FU Jian-li;QIAN Hong-juan;LIU Huan-liang;SHAO Shao-xiong;ZHANG Li-hua(China Institute of Atomic Energy,P.O.Box 275(88),Beijing 102413,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《核化学与放射化学》2021年第5期405-410,I0004,共7页Journal of Nuclear and Radiochemistry

摘　　要：采用标准加入-γ吸收法原理研制了铀浓度在线分析系统。利用不同厚度金属片对γ射线吸收程度的差异,通过在样品池与放射源之间添加金属片的方式实现固体内标的加入。研究工作中对测量模块的结构、内标材料的选择及在线流路进行了设计,编制了在线分析软件。采用有机相铀溶液对在线分析系统进行了测试,6次测定的平均值与真实值的相对偏差在3%以内,分析系统连续运行72 h的稳定性在1%以内。测试结果表明,铀浓度在线分析系统性能稳定,准确度高,适用于核燃料后处理工艺复杂基体中铀浓度的在线测量。This work designed a new uranium concentration on-line analysis system by using solid standard addition-γabsorption method.The calibrating table with different thickness metal slices were placed between radioactive source and sample flow-through cell.Different thickness metal calibrating slices are equivalent different uranium concentration.The structure of measuring module,inner standard material,on-line analysis flow path and analysis software had been designed and processed.The on-line analysis system was tested by using organic uranium solution.The results show that the system has a high accuracy with less than 3%relative deviation for uranium concentration.On-line measurement system has good stability with s_(r) less than 1%within 72 h.This on-line analysis system is applicable to determinate the uranium concentration of complex matrix in nuclear fuel reprocessing.

关 键 词：铀浓度 Γ吸收法 在线监测 

分 类 号：O657.62[理学—分析化学]