Abstract
Groups of male opossum (Didelphis virginiana) at 6 months of age were exposed to 350, 500, 550, 600, 650, 700, and 750 rad of whole-body /sup 60/Co radiation at a midline dose rate of 125 rad/min. The 30-day LD/sub 50/ was 511 rad with 95% confidence limits of 454 to 576 rad. The overall mean survival time was 17.9 days and the highest incidence of death occurred on the 16th day.
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