On the Evaluation of Po-210 Bioassay for Uranium Mine Workers in Japan for the Personal Exposure Index to Radon Daughters

概要

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As an indicator nuclide for inhalation exposure to Rn daughters of mine workers in a Japanese uranium mine, Po-210 urinalysis of the workers and surveys of some environmental factors were cond, ucted. An estimation study from the concentrations of Rn daughters in the mine indicated that about 800〜50 pCi of Po-210 could have been accumlated in each miner's body. According to the results of the urinalysis for several times in 5 years, however, statistical difference was not clearly identified in the quantity of Po-210 in urine among miners and non-mining workers there. Investigations on the concentrations of Po-210 in the mine's air, waters, foods of about 30 kinds, cigarets and on feces-urine ratios of Po-210 on human revealed that these factors would greatly affect the metabolism and excretion of Po-210 of the workers. In particular, some marine foods in Japan contained a great amount of Po-210 (several hundreds times of other foods) and cigarets showed 0.3〜0.8 pCi of Po-210 per gramme. Smokers excreted more P0-210 in urine definitely than non-smoker. Feces-urine ratios changed between 5.2-42.9 on a human subject. Therefore, it can be concluded that Po-210 would not be a good indicator for the personal exposure to Rn daughters, unless a great care were taken on the foods and smoking habits of mine workers, in addition to exposure conditions in the uranium mine.
日本放射線影響学会の論文