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一、引言中国计量科学研究院(NIM)分别于1973年和1978年组织了全国第一次~(60)Co核素活度测量比对和全国~(134)Cs活度测量比对,取得了可喜的成绩。为了进一步提高放射性核素活度的测量水平,统一全国量值,于1989年5月至9月又开展了第二次全国~(60)Co活度测量比对。共有六个部级或国家级的标准实验室使用七套绝对测量装置参加了比对。使用的~(60)Co标准溶液于1984年制备,1989年5月至7月分发给各个参加比对的实验室。参加实验比对的单位是:国防科工委放射性计量一级站(简称计量一级站)、中国原子
I. Introduction The China National Institute of Metrology (NIM) organized the first ~ (60) Co nuclear activity measurement comparison and the national ~ (134) Cs activity measurement comparison in 1973 and 1978 respectively, obtaining The gratifying results. In order to further improve the measurement of radionuclide activity and unify the national values, the second national ~ (60) Co activity measurement comparison was conducted from May to September 1989. A total of six ministerial or national standards laboratories using seven sets of absolute measurement device to participate in the comparison. The ~ (60) Co standard solution used was prepared in 1984 and distributed to all participating laboratories from May to July 1989. Participate in the experimental comparison of units are: National Defense Science and Technology Commission radioactive measurement of a station (referred to as a measurement station), China Atomic