Abstract
Summary
Adult male hamsters were placed in a hot room, 34-35°, and heat acclimated for 2 months. Controls were maintained at 24°. Each animal was given a single whole-body exposure to ionizing radiation from a 60 cobalt source. Half of the heat-acclimated animals were then transferred to 24° and half returned to the hot room. Half of the controls were placed in the hot room after irradiation. Comparisons of survival times were made; heat exposure either before or after irradiation, or both before and after irradiation lowered the survival time to less than 50% that of the controls, i.e., hamsters which were irradiated but not heat exposed.
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