固定式环境γ谱仪量值溯源方法  

Discussion on traceability method for fixed environmental γ spectrometer

作　　者：赵超[1] 宋家斑 张瑜[2,3] 何林锋[1] 唐方东[1] 

机构地区：[1]上海市计量测试技术研究院 [2]复旦大学放射医学研究所 [3]环境保护部辐射环境监测技术中心

出　　处：《上海计量测试》2017年第3期9-12,共4页Shanghai Measurement and Testing

基　　金：上海市质量技术监督局科研计划项目(2015-ZX001)

摘　　要：对一台类似于固定式环境γ谱仪的自主研发Na I(Tl)γ谱仪开展基本性能测试实验。其本底计数率约为(647.1±0.4)s^(-1)(k=1),远大于JJG 417-2006《γ谱仪》检定规程要求的8 s^(-1)。在该本底计数率下,γ谱仪无法完成JJG 417-2006提出的刻度源、活度检测项目中放射性样品的测量。这表明JJG 417-2006不适用于固定式环境γ能谱仪。针对此问题,依据固定式环境γ谱仪使用环境、监测对象及技术指标,对其新的量值溯源方法进行了探讨。Basic performance tests were conducted on a self-develop NaI（Tl） γ spectrometer which is similar to the common fixed environmental γ spectrometer. The background counting rate of the NaI（Tl） γ spectrometer was determined to be （647.1±0.4） s-1 （k = 1）, which is much larger than the require （8 s-1） in JJG 417-2006 γ Ray spectrometer. With this background counting rate, the γ spectrometer was incapable to measurement the radioactive sample mentioned in JJG 417-2006. This indicated that JJG 417-2006 was not applicative to the fixed environmental γ spectrometer. Aiming at the problem, new traceability method was discussed considering the service conditions, monitoring object and performance of the fxed environmental γ spectrometer.

关 键 词：固定式环境γ谱仪 NaI(Tl)谱仪 量值溯源 

分 类 号：TB98[一般工业技术—计量学]