Study type: Medical/biological study (experimental study)

Behavioral thermoregulation in the squirrel monkey: adaptation processes during prolonged microwave exposure med./bio.

By: Adair ER, Adams BW
Published in: Behav Neurosci 1983; 97 (1): 49-61
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Aim of study (acc. to author)

To explore the effects of longer irradiation durations on thermoregulatory behavior of monkeys.

Background/further details

Monkeys were restrained inside an anechoic chamber which was heated and cooled by forced convection. The monkeys learned to control the temperature of the circulating chamber air by selecting between cold (10-15°C) and warm (50-55°C) air sources.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 2.45 GHz
Modulation type: CW
Exposure duration: 10 min
Exposure 2: 2.45 GHz
Modulation type: CW
Exposure duration: 5-50 min; 5, 10, 15, 20 and 25 min followed by same off time
  • power density: 200 W/m² maximum (4, 10, 20 mW/cm²)
  • SAR: 600 µW/g minimum (whole body)
  • SAR: 3 mW/g maximum (whole body) (0.6-3.0 W/kg)
Exposure 3: 2.45 GHz
Modulation type: CW
Exposure duration: continuous for 2.5 h
  • SAR: 3 mW/g maximum (whole body) (0.6-3.0 W/kg)
  • SAR: 600 µW/g minimum (whole body)
  • power density: 200 W/m² maximum (10 or 20 mW/cm²)

Exposure 1

Main characteristics
Frequency 2.45 GHz
Type
Waveform
Charakteristic
Exposure duration 10 min
Modulation
Modulation type CW
Exposure setup
Exposure source
Chamber Anechoic chamber/ 1.8 x 1.8 x 2.5 m
Parameters
Measurand Value Type Method Mass Remarks
power density 80 W/m² maximum measured - 6-8mW/cm²

Exposure 2

Main characteristics
Frequency 2.45 GHz
Type
Waveform
Charakteristic
Exposure duration 5-50 min; 5, 10, 15, 20 and 25 min followed by same off time
Modulation
Modulation type CW
Exposure setup
Exposure source
Chamber 1.8 x 1.8 x 2.5 m anechoic chamber
Setup Monkey chair-restained, nonuniformity 8% without and 13% with chair (50 x 50 cm plane)
Parameters
Measurand Value Type Method Mass Remarks
power density 200 W/m² maximum measured - 4, 10, 20 mW/cm²
SAR 600 µW/g minimum calculated whole body -
SAR 3 mW/g maximum calculated whole body 0.6-3.0 W/kg

Exposure 3

Main characteristics
Frequency 2.45 GHz
Type
Waveform
Charakteristic
Exposure duration continuous for 2.5 h
Modulation
Modulation type CW
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
SAR 3 mW/g maximum calculated whole body 0.6-3.0 W/kg
SAR 600 µW/g minimum calculated whole body -
power density 200 W/m² maximum measured - 10 or 20 mW/cm²

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • during exposure

Main outcome of study (acc. to author)

The 4 mW/cm² microwave irradiation did not modify thermoregulatory behavior, no matter how long it lasted. The 10 and 20 mW/cm² exposures stimulated the animals to select ambient temperatures 1.5 and 3.0°C cooler than control levels, respectively. Except during the first microwave presentation of a series, or during the early minutes of a single long irradiation, duration had no significant effect on selection of air temperature or on the body temperatures achieved thereby.

Study character:

Study funded by

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