Study type: Medical/biological study (experimental study)

Biological and morphological effects on the brain after exposure of rats to a 1439 MHz TDMA field. med./bio.

Published in: Bioelectromagnetics 2000; 21 (5): 364-371

Aim of study (acc. to author)

To investigate the athermal effects of exposure to a 1439 MHz TDMA field, as used in cellular phones, on the permeability of the blood-brain barrier, on the morphological changes of the brain and on body-mass fluctuations.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 1.439 GHz
Modulation type: pulsed
Exposure duration: repeated daily exposure for 1 h/day for 5 consecutive days and 2 days of rest, for 2 or 4 weeks
  • SAR: 2 W/kg peak value (brain)
  • SAR: 0.25 W/kg mean (whole body)
Exposure 2:
Exposure duration: continuous for 2 h
  • SAR: 20 W/kg average over mass (brain)

Exposure 1

Main characteristics
Frequency 1.439 GHz
Type
Charakteristic
Exposure duration repeated daily exposure for 1 h/day for 5 consecutive days and 2 days of rest, for 2 or 4 weeks
Modulation
Modulation type pulsed
Additional info

signal used for PDC (Personal Digital Cellular, Japanese cellular telephone standard)

Exposure setup
Exposure source
Chamber The exposure system was based on the reference article with some modifications.
Setup Eight tubes were mounted circularly on a round turntable. Rats were confined in the tubes with their heads toward the central monopole antenna, each tube being ventilated from head to tail.
Additional info Rats were divided into three groups: with and without exposure and control group. The rats in the control group were neither placed in tubes nor were they exposed.
Parameters
Measurand Value Type Method Mass Remarks
SAR 2 W/kg peak value - brain -
SAR 0.25 W/kg mean - whole body -

Exposure 2

Main characteristics
Frequency
Type
Exposure duration continuous for 2 h
Exposure setup
Parameters
Measurand Value Type Method Mass Remarks
SAR 20 W/kg average over mass - brain -

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

A 1439 MHz TDMA field did not induce observable changes in the permeability of the blood-brain barrier, morphological changes in the cerebellum, or body mass changes .

Study character:

Study funded by

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