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Toxicology of 85Kr: tissue distribution and retention in the rat.

Wistar rats were exposed to 85Kr gas atmospheres to determine saturation/desaturation kinetics in major tissues. Tissue partition coefficients [concentration 85Kr in tissue (muCi/g)/concentration of 85Kr in the atmosphere (muCi/cc)] were determined following equilibration with 85Kr gas. Tissue partition coefficients were highest for adrenals and fat; lowest for bone, heart and brain. Tissue partition coefficients for immature rats, 1-12 days of age, and for adults, were not significantly different. The highest concentrations of 85Kr were found in fatty tissues and in gas pockets in the intestinal lumen.