采用无源效率刻度方法,对中国计量科学研究院提供的比对样品进行γ能谱无损测量和分析,测量分析结果及其与参考值的活度误差为:对226Ra(强度为223.75Bq)的误差为13.8%;对232TH(强度为221.29Bq)的误差为3.7%;对40K(强度为593.35Bq)的误差为0.9%.同时,对该方法测量分析结果的不确定度和定量探测下限进行了评定.%Radioactive sample offered by Chinese Academy of Metrological Science was measured by ISOCS efficiency calibration. The results of measurement as follows: 226Ra:223.75 Bq, + 13.8％ ;232 Th : 221. 29 Bq, + 3.7％ ;40K :593.35 Bq, + 0.9％. Evaluation and expression of uncertainty and detection threshold in measurement were also studied.
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