The Lethal Dose of Whole-Body Tantalum182Gamma Irradiation for the Burro (Equus asinus asinus)

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Abstract
Using a previously described exposure device (Wilding, Nucleonics 10, 36 - 40, 1952) employing Ta182 as a source of gamma radiation, designed for lethal dose studies on large animals, the present study attempted to establish the LD-50/30 days for the burro. Ninety animals were used ranging in weight from 115-177 kg. Ten burros were exposed to each of the doses ranging from 300 to 820 r given at a rate of 18 to 23 r/hr. The LD-50/30 was estimated to be 651 r with a 95% confidence interval of 621-683 r. The survival time of the animals dying from total body irradiation delivered in this manner varied between 20 and 41 days (avg. 26.5 days).