海水放射性监测报警装置对137Cs直接测量的不确定度分析  

Uncertainty analysis of ^(137)Cs direct measurement with the monitoring and alarm device for seawater radioactivity

作　　者：苏健[1] 曾志[1] 何建华[2] 马豪[1] 余雯[2] 

机构地区：[1]清华大学工程物理系粒子技术与辐射成像教育部重点实验室,北京100084 [2]国家海洋局第三海洋研究所,福建厦门361005

出　　处：《辐射防护》2015年第1期55-58,64,共5页Radiation Protection

基　　金：科技部科技基础性工作专项“海洋核应急监测方法与评价标准”(2012FY130200);清华大学自主科研项目“海洋放射性在线监测关键问题研究”(2011080965);国家863计划“核事故应急关键技术研究”(2012AA050907);海洋公益性项目“核电海域放射性检测新技术与辐射防护评价研究”(200705028)

摘　　要：不确定度是监测装置性能的重要指标,分析和计算不确定度是海水137Cs的监测结果正确表述的必要前提。对一海水放射性监测报警装置直接测量海水中137Cs的不确定度来源进行了分析,实测了4个含有不同活度水平137Cs的西太平洋海水样品,并与放化分析结果进行了比较。结果显示该仪器的不确定度主要影响因素有海水样品γ计数率的相对不确定度、137Cs海水标准源γ计数率和体积的相对不确定度。Uncertainty is an important indicator for the performance of monitoring devices. Analysis and calculation of uncertainty are necessary prerequisites for correct representation of seawater137 Cs monitoring results. The main uncertainty causes of137 Cs direct measuring with a seawater monitoring and alarming device were analyzed. Four seawater samples from Western Pacific were measured and the results were compared with the radiochemical analyses. The main causes of the device's uncertainty were the relative uncertainty for the gamma count rate of seawater sample,the gamma count rate and the volume of137 Cs seawater standard source. The device was proved to give consistent results with radiochemical analysis within the range of uncertainty.

关 键 词：海水放射性 137Cs 直接测量 不确定度分析 

分 类 号：X834[环境科学与工程—环境工程]