Study type: Medical/biological study (experimental study)

A search for nonthermal effects of 434 MHz microwave radiation on whole human blood med./bio.

By: Dunscombe PB, Gammampila K, Ramsey NW
Published in: Radiat Res 1983; 96 (2): 235-250
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Aim of study (acc. to author)

Possible nonthermal effects of 434 MHz microwave radiation on human blood should be investigated in vitro.

Background/further details

Mean plasma levels of hemoglobin, sodium, and potassium were determinated. Plasma levels of hemoglobin and sodium and potassium ions serve as an indicator of red blood cell (erythrocytes) haemolysis, caused by an increased membrane fragility.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 434 MHz
Modulation type: CW
Exposure duration: 6 h
Exposure 2: 434 MHz
Modulation type: CW
Exposure duration: 6 h
  • power density: 100 mW/cm² minimum (unspecified) (225 mW/cm², 410 mW/cm², 600 mW/cm² max value; experiment 2*)

Exposure 1

Main characteristics
Frequency 434 MHz
Type
Waveform
Exposure duration 6 h
Modulation
Modulation type CW
Exposure setup
Exposure source
  • circular waveguide
  • rectangular 52x35cm, aluminium
Chamber TE10 mode, aluminium plate at lambda/4 as short circuit, absorbing material, 5ml polysterene tubes supported by expanded and solid polysteren support
Setup cylinder axis of tubes horizontal
Parameters
Measurand Value Type Method Mass Remarks
power density 225 mW/cm² - cf. remarks - free space power density; experiment 1 and 4
power density 540 mW/cm² - cf. remarks - free space power density; experiment 1 and 4
electric field strength 15 V/cm - cf. remarks - +/- 4 per cent

Exposure 2

Main characteristics
Frequency 434 MHz
Type
Exposure duration 6 h
Modulation
Modulation type CW
Exposure setup
Exposure source
Additional info Spherical samples placed as in exposition 1
Parameters
Measurand Value Type Method Mass Remarks
power density 100 mW/cm² minimum - unspecified 225 mW/cm², 410 mW/cm², 600 mW/cm² max value; experiment 2*
Additional parameter details

*the power flux density values below are approximated from Figure.4 on page 241

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

Indicated by the measurements no increased membrane fragility was observed, which could be clearly assigned to nonthermal effects.

Study character:

Study funded by

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