Measurements of 210Po and 210Pb in total diet samples: Estimate of dietary intakes of 210Po and 210Pb for Japanese

To estimate the dietary intakes of Pb-210 and Po-210 for the Japanese adults and their annual effective doses, Pb-210 and Po-210 were measured for 240 daily diet samples collected at two locations of Ishikawa Prefecture in Japan over three years by duplicate portion studies. No appreciable differences in intake rates of Pb-210 and Po-210 and their Po-210/Pb-210 ratios were seen among the years in each district, and between the two districts. The intake rates evaluated using 240 diet samples were 0.20 Bq/d/p for Pb-210 and 0.61 Bq/d/p for Po-210 as a median, respectively. Annual effective doses of Pb-210 and Po-210 for Japanese adults were estimated to be 0.050 and 0.053 mSv/y, respectively.