Temperature regulation in the mouse and hamster exposed to microwaves in hot environments

Technical Report · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5283610

Gordon, C J; Long, M D; Fehlner, K S; Stead, A G

Colonic temperature was measured in naive BALB/c mice and golden hamsters immediately following 90-min exposures to 2450-MHz radiofrequency (RF) radiation at an ambient temperature (Ta) of 32.2 or 35 C (dry air). Exposures were performed in a temperature-controlled waveguide that permitted continuous monitoring of the specific absorption rate (SAR) of RF energy. At a Ta of 32.2 C, the threshold SAR for elevating colonic temperature and the SAR resulting in a 1.0 C elevation in colonic temperature were, respectively, 4.3 and 10.0 W/kg for the mouse and 0.69 and 1.9 W/kg for the hamster. At a Ta of 35 C, these values were 0.12 and 5.3 W/kg for the mouse and 0.46 and 1.4 W/kg for the hamster. The SARs required to induce hyperthermia in the mouse and hamster at these relatively warm Ta's are considerably lower than those required at cooler Ta's of 20 to 3 C. Overall, the hamster became hyperthermic at lower SARs than in the mouse. Ta's of 35 C and greater are frequently encountered during heat waves in the summer months.

• Research Organization: Environmental Protection Agency, Research Triangle Park, NC (USA). Health Effects Research Lab.
• OSTI ID: 5283610
• Report Number(s): PB-88-170949/XAB; EPA-600/J-86/446
• Country of Publication: United States
• Language: English

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560400* -- Other Environmental Pollutant Effects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
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BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BODY TEMPERATURE
CONTROL
ELECTROMAGNETIC RADIATION
FREQUENCY RANGE
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MICROWAVE RADIATION
RADIATION EFFECTS
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RODENTS
TEMPERATURE CONTROL
THERMOREGULATION
VERTEBRATES