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本文介绍一地下室铁室铅室组合屏蔽低本底ＨＰＧｅγ谱测量系统。该系统由地下铁室和在其内的铅室组成组合物质屏蔽；在１００～２０００ｋｅＶ能区，相对效率为３８．４％的ＨＰＧｅ探测器积分本底计数率为０．７／ｓ，本底效率比为１．８２／ｓ；谱数据收集时间为１０００ｍｉｎ时对１３７Ｃｓ点源的探测下限为３．４ｍＢｑ。作为举例，还介绍了用该系统分析测量反应堆退役清洗去污后的不锈钢管道样品中１３７Ｃｓ和６０Ｃｏ含量及分布的结果。
This article describes a basement iron room lead chamber combination shielding low background HPGe gamma spectrometry system. The system is composed of a combination of a subway room and a lead chamber in the underground room to shield it; in the 100 ~ 2000keV energy range, the relative efficiency of 38.4% HPGe detector integral background count rate of 0.7 / s, background The efficiency ratio is 1.82 / s; the detection limit of 137Cs source is 3.4mBq when the spectral data collection time is 1000min. As an example, the results of analyzing 137Cs and 60Co contents and distributions in the stainless steel pipe samples after decommissioning, cleaning and decontamination of the reactor were also introduced by using the system.