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Analyses of tissue aliquots from a plutonium process operator, who had been exposed to Pu239 largely via chronic low-level inhalation for approximately 6 out of 11 ½ years of employment, showed that he had accumulated a body burden of approximately 0.018 µc. Estimations of his body burden from his urine assay record ranged from 0.019 to 0.034 µc. The highest plutonium concentration (125 dis/min per g) was found in pulmonary lymph nodes, followed by liver (9.9 dis/min per g), lungs (4.8 dis/min per g) and bone (average of sternum, rib and vertebra, 1.4 dis/min per g). Some implications of these findings to chronic low-level inhalation exposures and to estimation of body burden from urine assays are discussed.

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