EFFECT OF HEAD VERSUS TRUNK FISSION-SPECTRUM RADIATION ON LEARNED BEHAVIOR IN THE MONKEY.
Rept. for Nov 67-Feb 68,
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX
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Twenty-two Macaca mulatta monkeys, trained to a discrete avoidance task, were divided into three groups for exposure to either head only, trunk only, or whole-body radiation with a pulsed fission source. A total dose of 6,250 rads was delivered in a 20-msec. pulse. Trained behavior and blood pressure were monitored continuously during the first hour postirradiation. Results indicate that 1 head or trunk irradiation will produce deterioration in performance 2 early performance decrement results primarily from a direct effect of radiation on cephalic structures 3 this head effect is dose-rate dependent 4 trunk effects are significant in producing a more uniform early decrement and a more severe later decrement and 5 the hypotensive response seen immediately after whole-body radiation is secondary to radiation effects within the trunk. Author