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2004年6-8月,中国计量科学研究院电离辐射处参加了国际计量局(B IPM)组织的125I放射性溶液活度测量国际关键比对。我们采用KX射线和γ射线的探测效率符合相加原理,选用4π井形NaI晶体测量装置对125I的活度进行绝对测量。测量结果与平均值相差1.3%.
From June to August 2004, the ionizing radiation department of China National Academy of Metrology participated in the international key alignment of 125I radioactive solution activity measurement organized by International Bureau of Metrology (BIPM). We use KX-ray and γ-ray detection efficiency in line with the principle of summation, the selection of 4π well NaI crystal measuring device on the 125I activity absolute measurement. The difference between the measurement and the average is 1.3%.