[The determination of 210Pb in lead (author's transl)]

Since lead contains more or less 210Pb, the selection for lead materials has to be done before construction of the low level radiation shield. In this paper, a method for determination of 210Pb is based on radioanalytical separation such as DDTC (sodium diethyl dithio carbamate) extraction followed by beta ray counting of 210Bi. Fourteen commercial lead samples and three old lead samples were analysed for 210Pb. The concentration for 210Pb in commercial samples was found to range from 0.063 to 11 Bq/g (1.7 to 300 pCi/g) and in old samples was less than 0.01 Bq/g (0.3 pCi/g). These results will be useful to the selection of shielding material. The detection limit and the time required for 210Pb determination was 0.003 Bq/g (0.1 pCi/g) and 5.5 hours, respectively.