Three identical rectangular waveguide chambers made of aluminium were used in the study. The exposure chamber consisted of a straight rectangular section (24.8 cm x 20 cm) and of two waveguide-to-coaxial adapters. The total length of the chamber with the adapters was 190 cm. The mice were kept in small cylindrical acrylic restrainers (i.d. 32 mm, length adjustable) preventing them from aligning their longitudinal axis parallel to the electric field. The restrainers were placed 25 at a time on a Styrofoam holder so that each mouse was in the center of the cross section of the waveguide with its longitudinal axis perpendicular to the electric field and the direction of propagation. The distance between adjacent mice was 5 cm. The mice that were missing were replaced with mouse phantoms made of plastic cylinders partly filled with a solution simulating the dielectric properties of muscle at 900 MHz.
Aufbau
Modified and computer-controlled mobile phones were used as signal sources. The signals were amplified by boosters manufactured for vehicle use. RF power meters were used for measuring the input, reflected and output power of the exposure chamber. The output power was absorbed by a coaxial 10 W termination. The SAR was controlled daily by adjusting the input power.
Zusatzinfo
The animals were randomized into four equal groups: NMT exposure, GSM exposure, sham exposure and cage control. The sham exposed group was kept in an unenergised waveguide chamber. The mice in all groups except the cage-control group were exposed to ionizing radiation at the beginning of the study. The total-body dose was 4 Gy delivered as three equal fractions of 1.33 Gy at 1-week intervals with linear accelerators. The dose rate was 0.51 Gy/min. To ensure a uniform irradiation of the whole body, a Plexiglas scatterer was placed 15 cm above the animals.
Forschungsgemeinschaft Funk e.V. (FGF) (Research Association for Radio Applications), Germany
Sonera, Finland
Tekes (National Technology Agency), Finland
The Finnish Work Environment Fund
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