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Mortality data for C57BL mice and Sprague-Dawley rats were collected as a part of the program to biologically characterize AFRRi TRIGA reactor radiations and to provide reference information for future studies. Unilateral whole body exposures to mixed gamma-neutrun radiations from the reactor or to 250 kVp x rays were carried out over a range of midlin, tissue doses from 371,) to S75 rads. The 30-day median lethal doses were calculated to be 589 and 432 rads for mice exposed to the x rays and to the reactcr radiations, respectively. The corresponding values for the rat exposures were 740 and 4'4 rads. Using thne LD5) "30 values as the end points for comparison, the reactor radiations v-'.re 1.4 and 1.7 times more effec.tive in mice and rats, respectively. than were the x raye. The surlval Lime-of the mice and rats exposed to reactor radiations were significantly :ess than those of the animals exposed to k ,lnilar (loses of x rays.