Abstract
About 1300 mice were exposed to graded doses of x-rays given by whole or partial body irradiation. For the partial body irradiation, the following three groups were assigned : head exposure, trunk exposure (chest and abdomen) and lower body exposure (pelvis, legs and tail). LD50(30)s were determined for each of the exposures. Daily death distributions after the exposure were observed in 30 days. The partial body irradiations produced specific daily death distributions, specific to the region exposed. The relative patterns of the daily death distributions were nearly independent on the doses over a wide range. Consequently there appeared plateaus in dose versus survival time curves after the head or the lower body exposure. The one after the head exposure could be attributed to oral death. There is no information on a cause of death for the plateau region of the lower body exposed group.
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