Accession Number : ADP002083

Title :   In Vivo Temperature Measurements during Whole-Body Exposure of Macaca mulatta to Resonant and Nonresonant Frequencies,

Corporate Author : SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX

Personal Author(s) : Krupp,J. H.

Report Date : OCT 1981

Pagination or Media Count : 13

Abstract : Anesthetized rhesus monkeys, implanted with Vitek temperature probes (in the wrist, ankle, thigh and biceps) and fitted with a rectal probe, were exposed ventrally to planewave 219 MHz RFR (E polarization) at controlled environmental temperature. The variety of exposure parameters and anatomical sites, explored in many combinations, failed to reveal the existence of tissue hot spots, localized regions of greatly-elevated temperature. Exposure to a frequency near whole-body resonance (219 MHz) produced a significant rise in body temperature at relatively low incident power levels when compared to comparable exposures to a frequency well above resonance (2.06 GHz) explored in an earlier study. Whole-body SAR, however, was at a level where temperature increase would be anticipated. Lower set-point temperatures in the limbs, as well as increases in peripheral blood flow that are unaccounted for by models, probably act to negate the predicted effects of unequal energy absorption on local tissue temperature.

Descriptors :   *Microwaves, *Radiation effects, Symposia, Radiofrequency, Rhesus monkeys, In vivo analysis, Temperature, Body temperature, Measurement, Exposure(Physiology), Physiological effects

Distribution Statement : APPROVED FOR PUBLIC RELEASE