Abstract
The influence of dietary K on the retention of chronically ingested Cs/ sup 137/ by muscle, liver, testes, femur, whole blood, and brain was determined by long-term isotope studies and a short-term double-tracer study with K/sup 42/ and Cs/sup 137/. At 35 days, it was observed that a ninefold elevation in dietary K caused a twofold reduction in Cs/sup 137/ retention. This is probably the maximum effect. Tissue K levels were not altered by dietary K levels. The pattern of Cs/sup 137/ accumulation by the selected tissues at 1 day was different from that at35 days. At 1 day, the levels of Cs/sup 137/, in decreasing order, were liver, muscle, testes, femur, whole blood, brain. At 35 days, the levels, in decreasing order, were muscle, liver, testes, brain, femur, whole blood. It was calculated that the Cs/K ratio of the tissues divided by the Cs/K ratio of diet varied almost proportionally with dietary K levels; a ninefold increase in dietary K caused about a fivefold increase in Cs/K ratio (diet -- tissue). Therefore, it appears that the concept of discrimination factor has severe limitations in theoretical and practical application for this ion pair. In the shortterm double-tracer study, dietary Kmore » decreased Ku retention but did not influence Cs/sup 137/ retention. It was concluded that potassium does not effectively compete with cesiunn for membrane transport sites or intraceliular binding sites. (auth)« less
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