Approximately 800 mice, divided into four age groups varying from 122 to 369 days, were given single exposures to P U~~~O , aerosols. Each age group was separated into a control and five subgroups, containing different amounts (0.038-0.72 nc) of Pu239 in the lung. The mean age at time of death wits established for each subgroup. Comparison of P~~3~-exposed mice with controls indicated no significant shortening of life span. No malignant tumors were seen.
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