AD0729259ACTIVEUNCLASSIFIEDARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MDTurbyfill,C. L.Roudon,R. M.Kieffer,V. A.Behavior and Physiology of the Monkey 'Macaca Mulatta' Following 2500 Rads of Pulsed Mixed Gamma-Neutron Radiation,UNCLASSIFIEDAUG 19712829.60AFRRI-SR71-10DASA-NWER-XAXMC903UNCLASSIFIEDAPPROVED FOR PUBLIC RELEASEUNCLASSIFIEDUNCLASSIFIEDUNCLASSIFIED00110347002406DOD AGENCIESDTIC AND NTIS197120Six monkeys, which had been trained to perform a shock motivated visual discrimination task, and which had been surgically implanted to monitor aortic and venous pressures, carotid flow, heart rate and respiratory rate were irradiated with a 2500-rad midline tissue doses of mixed gamma-neutron radiation. Four of the six animals displayed an early performance decrement (less than 90 percent correct responses) within a few minutes following irradiation. One animal showed no performance decrement, and one animal made only five responses and then ceased to perform at all following irradiation. Animals which displayed a performance decrement suffered an acute decrease in aortic pressure. The first physiological indication of the ensuing incapacitation period was a rapid fall of diastolic pressure followed by a decrease in systolic pressure. A second period of behavioral decrement was observed in five of the six animals at approximately 40-45 minutes postirradiation. The respiratory rate was, in general, significantly increased following irradiation. No significant changes were observed in carotid flow or venous pressure. (Author)(*WHOLE BODY IRRADIATION, MONKEYS), (*BEHAVIOR, RADIATION EFFECTS), (*PHYSIOLOGY, RADIATION EFFECTS), GAMMA RAYS, NEUTRONS, PULSE RATE, RESPIRATION, BLOOD PRESSURERADIOBIOLOGYRESPIRATORY RATE, HEART RATE