Study type: Medical/biological study (experimental study)

Millimeter wave absorption in the nonhuman primate eye at 35 GHz and 94 GHz med./bio.

By: Chalfin S, D'Andrea JA, Comeau PD, Belt ME, Hatcher DJ
Published in: Health Phys 2002; 83 (1): 83-90
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Aim of study (acc. to author)

To evaluate the effects of pulsed 35 GHz and 94 GHz millimeter wave exposure on primate eye.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 35 GHz
Modulation type: pulsed
Exposure duration: 1.5 s to 5 s
Exposure 2: 94 GHz
Modulation type: pulsed
Exposure duration: 2 s to 4 s
Exposure 3: 94 GHz
Modulation type: pulsed
Exposure duration: 2 s to 4 s

Exposure 1

Main characteristics
Frequency 35 GHz
Exposure duration 1.5 s to 5 s
Modulation
Modulation type pulsed
Pulse type rectangular
Additional info

pulse duration of 50-500 µs 5-50 % duty cycles
Exposure setup
Exposure source
Distance between exposed object and exposure source 0.01 m
Setup subject placed in a specially constructed restraining chair
Parameters
Measurand Value Type Method Mass Remarks
power density 8 W/cm² maximum - unspecified at an exposure duration of 1 s.
power 75 W maximum cf. remarks - Output power
power density 2 W/cm² unspecified - unspecified at an exposure duration of 1.5 s to 5.0 s

Exposure 2

Main characteristics
Frequency 94 GHz
Exposure duration 2 s to 4 s
Modulation
Modulation type pulsed
Pulse type rectangular
Additional info

pulse duration of 50-500 µs 5-50 % duty cycles
Exposure setup
Exposure source
Distance between exposed object and exposure source 0.01 m
Parameters
Measurand Value Type Method Mass Remarks
power 50 W maximum cf. remarks - Output power
power density 8 W/cm² maximum - unspecified at an exposure duration of 1 s.
power density 2 W/cm² unspecified - unspecified at an exposure duration of 2.0 s to 4.0 s.

Exposure 3

Main characteristics
Frequency 94 GHz
Charakteristic
Exposure duration 2 s to 4 s
Modulation
Modulation type pulsed
Pulse type rectangular
Additional info

pulse duration of 50-500 µs 5-50 % duty cycles
Exposure setup
Exposure source
Additional info Far Field exposures conducted at 1 m from the antenna.
Parameters
Measurand Value Type Method Mass Remarks
power density 2 W/cm² unspecified - unspecified at an exposure duration of 2.0 s to 4.0 s.
power density 8 W/cm² maximum - unspecified at an exposure duration of 1 s.
power 800 W maximum cf. remarks - Output power

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated organ system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

Shame exposure at 35 or 94 GHz did not result in tissue damage. Corenal temperature measurements (given only for 95 GHz exposure) revealed a temperature shift up to 35°C. The detected lesions are distinct, involving only the superficial layers of the corena, and are reversible within 24 h. The findings of this study suggests thresholds for 35 GHz and 94 GHz exposure of 7.5 J/cm2 and 5 J/cm2, respectively.

Study character:

Study funded by

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