Performance of the Monkey Following Two Unequal Pulses of Radiation
ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD
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Ten monkeys housed in primate restraining chairs were trained to criterion performance on a shock avoidance visual discrimination problem. They were then exposed to a 1700-rad pulse of mixed gamma-neutron radiation followed in 6 hours by a 3500-rad pulse. The decrement in performance during the first 20 minutes following the first 1700-rad pulse was equivalent to the decrement in this time period following the first 2500-rad pulse in a previously reported 2500 2500-rad multiple exposure study. However, the decrement in performance during the first 20 minutes following the 3500-rad pulse was as great as that in the 20 minutes following the first pulse, in contrast to the 2500 2500 group where there was a smaller decrement following the second pulse than after the first pulse. Performance in the entire 2 hours after the second pulse of the 1700 3500-rad group was superior to that following a single 5000-rad pulse.