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Abstract
The transfer of lead 203 (203Pb) and calcium 47 (47Ca) from mother to fetuses and litter was examined 48 hours after a single intravenous application of both radioisotopes to rats on the 18th day of pregnancy and on the fourth and 15th day of lactation.
The transplacental transport of lead was eight times lower than that of calcium while the transmammary transport of lead was four times lower. The highest transfer of both radioisotopes from mother to litter was observed during the late lactation period.