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Brain temperature measurements in rats: A comparison of microwave and ambient temperature exposures
Author(s) -
Ward Thomas R.,
Svensgaard David J.,
Spiegel Ronald J.,
Puckett Earl T.,
Long Merritt D.,
Kinn James B.
Publication year - 1986
Publication title -
bioelectromagnetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.435
H-Index - 81
eISSN - 1521-186X
pISSN - 0197-8462
DOI - 10.1002/bem.2250070302
Subject(s) - microwave , core temperature , air temperature , microwave heating , core (optical fiber) , materials science , chemistry , zoology , analytical chemistry (journal) , environmental chemistry , anesthesia , atmospheric sciences , medicine , composite material , biology , physics , quantum mechanics
In an effort to understand microwave heating better, regional brain and core temperatures of rats exposed to microwave radiation (2450 MHz) or elevated air temperatures were measured in two studies. In general, we have found no substantial evidence for temperature differentials, or “hot spots,” in the brain of these animals. In the first study, after a 30‐min exposure, no temperature differences between brain regions either after microwave or ambient air exposure were found. However, a highly significant correlation between brain and core temperatures was found and this correlation was the same for both microwave and ambient air heating. In the second study, time‐temperature profiles were measured in rats exposed to either 30 mW/cm 2 or 36.2°C. In this study, the 30‐min exposure period was divided into seven intervals and the change in temperature during each period was analyzed. Only the cortex showed significantly different heating rates between the air heating and microwave heating; however, this difference disappeared after the initial 5 min of exposure.