To establish a near maximum power density level of microwave irradiation at 6000 MHz which does not cause a significant increase in body temperature in the pregnant rat, and to study if protracted exposure to that power density level throughout pregnancy would result in embryopathic effects.
The rats (n=36) were randomly assigned to one of the 4 groups: Group 1: home cage control (n=5), Group 2: anechoic chamber control (n=10), Group 3: sham irradiated concurrent control (n=10) and Group 4: irradiated (n=11).
Preliminary studies indicated that 35 mW/cm² at 6 GHz would be an appropriate power density level. Exposure for 5 hours to this level did not result in an increase in body temperature.
The exposed fetuses exhibited slight but statistically significant growth retardation at term. Maternal monocyte count was also significantly depressed. No other parameters differed between the control animals and the exposed animals.