Thermal Responses to High-Frequency Electromagnetic Radiation Fields.

Monkeys were exposed to fields of 1000, 750, and 500 mW/sq cm. at 26 MHz in a coaxial transmission line for 6 hours. An immediate rise in skin and rectal temperature, with subsequent cooling, was noted. Rectal temperature reached an equilibrium after about 1.5 hours of exposure. This equilibrium was maintained throughout the remainder of the explosure period. Thermoregulatory mechanisms activated as a result of exposure to even the highest power (1000 mW/sq cm.) appear adequate to dissipate the imposed heat load. (Author)