Balance of Cobalt in Japanese People and Diet

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Measurements were made of the stable cobalt in total diet samples collected from a number of sites to know the normal daily ingestion of this element by average Japanese. Two thirds of Japanese adults should take 11-28 μg of cobalt daily and rural children, a half or less amount. The main contributors of cobalt in Japanese diet are plant products. Their contribution as a whole was estimated up to 88.2% of the total intake.<BR> Biological half-life of radiocobalt was estimated as 106 days (fw : 0.3) or 29.3 days (fw : 0.92) for Japanese on the basis of assumed existence of an equilibrium condition between the stable element and radiocobalt.<BR> Estimation of the daily intakes by Japanese of 60Co through marine and land products was also attempted in the assumed situation of environmental contamination of sea-water and soils.

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