Neutron Effectiveness for Causing Incapacitation in Monkeys
ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD
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Fifty-eight male monkeys Macaca mulatta were trained by shock avoidance conditioning to work a simultaneous visual discrimination problem. Trained subjects were irradiated in either a nuclear reactor-produced neutron field incident neutron to gamma ray ratio of about 10 or a similarly produced gamma ray field incident neutron to gamma ray ratio of about 0.1. In all exposures the midbrain dose rate was about 2000 radsminute. The midbrain dose most likely to cause early transient incapacitation ETI in 50 percent of the irradiated subjects was determined. The signs and symptoms of ETI were the same whether the monkey received gamma or neutron radiations.