Strontium-90 calcium interrelationships in man

Strontium-90-calcium interrelationships have been studied by determining 90Sr and calcium balances in man during the intake of different dietary levels of 90Sr and of calcium. On a calcium intake of about 1 g/day, given as milk, the urinary 90Sr/Ca ratio was about the same as the dietary 90Sr/Ca ratio and therefore the O.R. urine/diet was about 1, while on low calcium intake and on supplementing the diet with calcium as the gluconate the urinary 90Sr/Ca ratio differed considerably from the 90Sr/Ca ratio of the diet and the O.R, urine/diet was variable. The O.R, stool/diet was about 1 on all calcium intake levels. Stable calcium did not significantly decrease the net absorption of 90Sr, P < 0.1.