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Biological availability of radionuclides produced by the Plowshare Event Schooner. I. Body distribution in domestic pigs exposed in the field.

Abstract The biological availability and the distribution of radionuclides were studied in young Yorkshire pigs exposed to radioactive fallout from the Plowshare Event Schooner. Eight pigs were exposed in metabolic cages at various distances from ground zero in the expected path of the cloud, so that they could inhale debris and eat contaminated food. Three days after the detonation, the two pigs that were in the most contaminated portion of the fallout field were removed to a field laboratory, anesthetized with sodium pentobarbital, killed by exsanguination, and dissected. The organs were immediately sealed in tuna cans (capacity approximately 200 cm3) and sent to the Laboratory at Livermore for analysis for gamma-emitting radionuclides. The air filters that sampled the air at the pig station during the period of exposure were also canned and analyzed in the same manner. The radionuclides detected in the air filters were 188W/188Re, 132Te, 196Au, 131I, 103Ru and 74As; the short-lived 99Mo, 203Pb and 198Pu, although detected in the tissues, were too low in concentration for quantitation because of decay. The major radionuclides found in the pig tissues were 99Mo, 188W/188Re, 187W, 132Te, 203Pb, 196Au, 198Au, 131I, 103Ru and 74As. Comparisons between lungs, blood, and other tissues suggested that the lungs retained small amounts of 203Pb, 198Au, 103Ru and 74As. There seemed to be no differential concentration within the lung except perhaps for 198Au, which was more highly concentrated in the posterior portions. Of the other nuclides detected in the tissues, 99Mo was accumulated in kidney, liver, and gall bladder, 188W/188Re in kidney and bone, 187W in kidney, 196Au in the gall bladder, 198Au in the salivary gland, 103Ru in kidney and 74As in kidney, all in much higher concentrations than in blood.