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Removal of radioactive strontium from the rat by feeding stable strontium

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Abstract

The effect of administering the stable isotope of strontium (as phos-phate) at different dietary levels to adult rats (fed on a cereal and pulse-based diet containing 0.4% Ca) on the retention of radiostrontium (89Sr) and radiocalcium (45Ca) in the femur and the whole skeleton was studied for a period up to 6 weeks after an intraperitoneal injection of the two radioisotopes. The ability of strontium to remove89Sr under the above dietary conditions was examined. Feeding Sr at 0.5% or 1% levels for 6 weeks had no effect on the skeletal content of89Sr or45Ca while a dietary regimen of 2% Sr (2000 times the normal content), significantly lowered the89Sr and45Ca content by about 30% in the femur but not in the whole skeleton. At this Sr level, the urinary excretion of the isotopes increased with a concomitant decrease in their excretion in the faeces. This study underscores the limitations of dietary Sr to mobilise89Sr from the bones after it is incorporated in the bone mineral.

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Kshirsagar, S.G. Removal of radioactive strontium from the rat by feeding stable strontium. J Biosci 1, 99–107 (1979). https://doi.org/10.1007/BF02702892

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