Study type: Medical/biological study (experimental study)

Long-term exposure of young spruce and beech trees to 2450-MHz microwave radiation med./bio.

Published in: Sci Total Environ 1996; 180 (1): 43-48

Aim of study (acc. to author)

To investigate the long-term effect of high-intensity microwave radiation on trees.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 2.45 GHz
Modulation type: CW
Exposure duration: continuous for 3 years and 7 months

Exposure 1

Main characteristics
Frequency 2.45 GHz
Type
Exposure duration continuous for 3 years and 7 months
Modulation
Modulation type CW
Exposure setup
Exposure source
Distance between measurement device and exposed object 1 m
Additional info Trees grown at three different locations A, B and C; A and B were exposed while C was used as control and was shielded by a metal mesh.
Parameters
Measurand Value Type Method Mass Remarks
power 600 W - - - -
power density 10 mW/cm² minimum - - Group 1 = nearest to the EMF source
power density 30 mW/cm² maximum - - Group 1 = nearest to the EMF source
power density 1 mW/cm² minimum - - Group 2 = middle group
power density 3 mW/cm² maximum - - Group 2 = middle group
power density 0.1 mW/cm² minimum - - Group 3 = farest from the EMF source
power density 0.3 mW/cm² maximum - - Group 3 = farest from the EMF source

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

During the exposure period, the microwave radiator caused no visual symptoms of damage. Power flux densities had no effect on crown transparency. Height growth of shoots was not affected. Chlorophyll fluorescence data testified to similar potential photosynthetic activities in beech leaves of all exposure groups. The only effect of microwave exposure was a decrease of calcium and sulfur concentrations in beech leaves with increasing power flux density.

Study character:

Study funded by

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