摘要
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 in 2004 National Institute of Metrology of China had taken part in International Comparison of radioactivity measurement for()^(125)I,which was organized by Bureau International des Poids et Measures.We selected 4π NaI crystal measure device In the form of a well in order to absolute measure the activity of()^(125)I applying detectable efficiency KX ray and γ ray coincidence to a theory of addition.The result of measurement and mean value differ by 1.3%.
关键词
125I
符合相加
绝对测量
^(125)I
coincidence to addition
absolute measure
