Some Effects of 55-Mev Protons on Primates

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Abstract
Seventy-four primates were given spaced doses of 55-Mev protons to the whole body surface. The mortality data, hematological measurements, and LDH [lactic dexydrogenase] and SGOT [serum glutamic oxaloacetic transaminase] concentrations demonstrate an effect intermediate between that of poorly penetrating 32-Mev protons and that of radiation that completely penetrates the primate. In addition, 12 animals received partial-body exposures of 55-Mev protons in single spaced doses to the abdominal area. These exposures produced the gastrointestinal syndrome with no accompanying hematological injury, and a linear relationship between survival time and dose was demonstrated.