射气闪烁法测量水中^226Ra的几点建议  

Some Suggestions for Measuring ^(226)Ra in Water by Emanation Scintillation Method

作　　者：冯颖思[1] 蒋岚[1] 张衍津 邓飞[1] Feng Yingsi;Jiang Lan;Zhang Yanjin;Deng Fei(Guangdong Environment Radiation Monitoring Centre, Guangzhou, 510300)

机构地区：[1]广东省环境辐射监测中心,广州510003

出　　处：《辐射防护通讯》2018年第4期37-40,44,共5页Radiation Protection Bulletin

摘　　要：从进气系统、闪烁室刻度、测量时间等方面分析射气闪烁法对测量水中^(226)Ra的影响,提出优化建议:简化进气系统,采用纯氮气冲洗闪烁室和气路;延长标准源的封源时间,使累积因子大于0.9,可提高闪烁室K值的稳定性;含镭低的样品,需增加样品量、测量时间,以提高测量的准确性。The influence of air intake system, scintillation chamber calibration, measuring time and other factors on 226Ra measurement in water by the emanation scintillation method is analyzed. Suggestions for optimization are further proposed as follows: simplifying the intake system and flushing the scintillation chamber and gas path with pure nitrogen;prolonging the sealing time of the standard source, so that the cumulative factor is greater than 0.9, which can improve the stability of the K value of the scintillation chamber;increasing the sample size and measuring time to improve the measurement accuracy, for samples with low radium content.

关 键 词：^226RA 射气闪烁法 水 闪烁室 

分 类 号：X83[环境科学与工程—环境工程]