硫酸钡共沉淀射气闪烁法分析水中^226Ra测量结果不确定度评定  

Uncertainty Evaluation of Measurement Results of ^226 Ra in Water byBarium Sulfate Co-precipitation and Gas Scintillation

作　　者：刘金明 东双 梁兴初 张诗 何旭 LIU Jinming;DONG Shuang;LIANG Xingchu;ZHANG Shi;HE Xu(Tong Liao Uranium Co.,Ltd.,CNNC,Tongliao 028000,China;Nuclear and Radiation Monitoring Center of Inner Mongolia Autonomous Region,Baotou 014030,China)

机构地区：[1]中核通辽铀业有限责任公司,内蒙古通辽028000 [2]内蒙古自治区核与辐射监测中心,内蒙古包头014000

出　　处：《铀矿冶》2020年第4期292-294,299,共4页Uranium Mining and Metallurgy

摘　　要：对硫酸钡共沉淀射气闪烁法分析水中^226 Ra的分析方法不确定度进行了评定。其不确定度分量包括测量结果分散性引入的不确定度,闪烁室刻度系数引入的不确定度,闪烁室重复测量计数率引入的不确定度,测量方法回收率引入的不确定度,以及量筒量取水样体积引入的不确定度。当水样中^226 Ra活度浓度为2.0442 Bq/L时,其合成扩展不确定度为±0.3483 Bq/L(k=2)。The uncertainty of the analytical determination of ^226 Ra in water by barium sulfate co-precipitation and gas scintillation method was evaluated.The uncertainty components include the uncertainty introduced by the dispersiveness of measure results,the uncertainty introduced by the calibration coefficient of the scintillation cell,the uncertainty introduced by the counting rate of repeated measurement of the scintillation cell,the uncertainty introduced by recovery rate in measurement method,and the uncertainty introduced by the volume of water in measuring cylinder.When the activity concentration of ^226 Ra in sample is 2.0442 Bq/L,the uncertainty of synthesis expansion is±0.3483 Bq/L(k=2).

关 键 词：硫酸钡 沉淀 ^226 Ra 不确定度评定 

分 类 号：TL271.6[核科学技术—核燃料循环与材料] O657.4[理学—分析化学]