【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。更多还原

【Abstract】 Basic performance tests were conducted on a self-develop Na I（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 fixed environmental γ spectrometer.更多还原