The Dependence of Miniature Pig Performance Decrement upon Gamma Ray Dose Rate.
ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD
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Trained miniature pigs were irradiated in a nuclear reactor-produced gamma ray field. Dose rates at the midline of the brain were 470, 1000, 1500, 2000, or approximately 10,000,000 pulsed irradiation radsminute. Doses ranged from 1500 to 14,700 rads. Postirradiation performance data were used to calculate for each dose rate the most probable dose that would cause 50 percent of the animals to perform unsatisfactorily ED50. The miniature pigs response varied markedly with dose rate at less than 2000 radsminute ED50s were 10,570, 7780, 2500, and 2380 rads, respectively, for 470, 1000, 1500, 2000, and 10 to the 7th power radsminute. Survival times, however, did not appear to be dependent upon dose rate. Author