Abstract
Total diet samples collected in 1961 from 10 to 25 major cities were analyzed for radionuclides arising from nuclear debris (Sr/sup 90/, Cs.syo 137/, Ce/sup 144/, Pu/sup 239/, Zn/sup 65/), for natu ral radioactivity (Ra/sup 226/, Pb/sup 210/, K/sup 40/), and for the stable nuclides of Ca and K. The variability arising from collection of samples was not greater than that due to analytical procedures. Levels of Sr/sup 90/ in the total diet ranged from 2 to 15 mu mu c/gm of Ca. Vaules in the West, with the exception of the Far Northwest,-tended to be lower, but no marked differences were observed among other geographical regions. The Sr/sup 90//gm Ca values for adult diets, presumably because of their lower milk content, were higher than for infant and teenage diets. The values of Sr/sup 90//gm of Ca for the total diet were about 1.6 times those for the milk contained in the diet. It was calculated that 54% of the total Sr/sup 90/ intake came from dairy products, on the assumption that 75% of the Ca originated from this source. The daily intake of Ra/sup 226/ was estimated to be about 2 mu mu c in teenage and adult diets,more » and about 1 mu mu c in infant diets. Average daily intakes of the various radionuclides expressed in micromicrocuries, were as follows; K/sup 409/, 4,000; Cs/sup 137/, 50; Sr/sup 90/, 10; , 2; Pu/sub 239/, 0.1. (auth)« less
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