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铅金属块中经常含有放射性同位素~(210)Pb,在选材制作屏蔽体之前,必须测定其放射性强度。本文用DDTC(二乙二硫代氨基甲酸钠)将子体核素~(210)Bi进行溶剂萃取分离,通过测其β射线以定量~(210)Pb。用此法对市售14种铅金属块与3种老铅进行了~(210)Pb定量分析。市售铅块中~(210)Pb含量为0.063～11Bq/g(1.7～300pCi/g),老铅为0.01Bq/g(0.3pCi/g)以下。本方法的定量测定下限为0.003Bq/g(0.1pCi/g),分析所需时间为5.5小时。~(210)Pb的分离与测定:将铅金属块10g切成小片,
Lead metal blocks often contain radioactive isotopes (210) Pb, in the selection of the production of the shield, the radioactive intensity must be measured. In this paper, the daughter of radionuclide ~ (210) Bi was separated by solvent extraction using DDTC (sodium diethyldithiocarbamate), and the concentration of ~ (210) Pb was quantified by measuring its beta ray. This method was applied to the quantitative analysis of ~ (210) Pb in 14 kinds of lead metal blocks and 3 kinds of lead samples. The lead content in commercially available lead lumps is 0.063 to 11 Bq / g (1.7 to 300 pCi / g) and less than 0.01 Bq / g (0.3 pCi / g) for lead. The lower limit of quantitation of this method was 0.003 Bq / g (0.1 pCi / g) and the analysis required 5.5 hours. ~ (210) Pb separation and determination: the lead metal block 10g cut into small pieces,