Plasma Levels, Urinary Excretion, and Increase in Body Burden of Strontium-90 in Man

Data obtained from the administration of a single dose of Sr85 were applied to the cane of daily ingestion of Sr90. On the basis of various intake levels of daily Sr90 ingestion, the data were used to calculate possible values for excretions, body retentions, and plasma levels of Sr90 in human patients. By means of the relations found between Sr85 and Ca metabolism, the values of Sr90 for most individuals can also be obtained from urinary calcium excretion without alues for body retention are in line p 90/ analysis of bone samples. A wide occur in adults even on a single dietary Sr/sup 90/ intake as a result of differences in Variations of dietary intake further increase the range of body retentions. Two methods were used for the calculavels. Both indicate that, on a given ls of Sr90 vary relatively little in different individuals or from children to adults. Sr/sup 90/ er, directly with Sr90 intake and on an intake of 5 mu mu c of Sr90 per day are of the order of 0.10 mu mu c/1 plasma.