Study type: Medical/biological study (experimental study)

In vivo exposure of rats to GSM-modulated microwaves: flow cytometry analysis of lymphocyte subpopulations and of mitogen stimulation med./bio.

Published in: Int J Radiat Biol 1999; 75 (1): 111-113

Aim of study (acc. to author)

To compare spleen lymphocyte sub-populations and their mitogenic activity in rats sham-exposed or exposed to GSM-modulated microwaves.



Exposure Parameters
Exposure 1: 900 MHz
Modulation type: pulsed
Exposure duration: repeated daily exposure, 2 h/day, for 10 days

Exposure 1

Main characteristics
Frequency 900 MHz
Exposure duration repeated daily exposure, 2 h/day, for 10 days
Additional info plane wave
Modulation type pulsed
Duty cycle 12.5 %
Repetition frequency 217 Hz
Additional info


Exposure setup
Exposure source
Distance between exposed object and exposure source 60 cm
Chamber Animals were restrained in Plexiglas cages with the long axis parallel to the electric field.
Setup The horn antenna was placed 60 cm above the animals (plane-wave conditions).
Additional info Sham-exposed animals were placed in a second anechoic chamber under the same conditions, except for the presence of EMF.
Measurand Value Type Method Mass Remarks
power density 55 µW/cm² mean - - -
SAR 0.075 W/kg - measured - -
power density 200 µW/cm² mean - - -
SAR 0.27 W/kg - measured - -

Reference articles

  • Chagnaud JL et al. (1999): No effect of short-term exposure to GSM-modulated low-power microwaves on benzo(a)pyrene-induced tumours in rat

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

No alterations were revealed in the surface phenotype of splenic lymphocytes or in their mitogenic activity. Low-level pulsed microwaves do not seem to affect the immune system.

Study character:

Study funded by

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