The exposure system [Schonborn et al., 2000] located inside an incubator consisted of two 128.5 x 65 x 424 mm³ brass single-mode waveguide resonators (equipped with DC ventilators) that were assigned to exposure or sham condition by the computer-controlled signal unit ensuring blind conditions for the experiment.
Each resonator was equipped with a plastic holder holding six 35-mm Petri dishes arranged in two stacks in the H-field maxima of the standing wave (E-polarization).
Eine Scheinexposition wurde durchgeführt.
More than 90% of the power coupled into the waveguides was reflected and directed into a 50-Ω terminator via the circulator (included in the amplifier).
The temperature of the monolayer cells was uniformly distributed without localized "hot spots". The increase in temperature due to the RF EMF was well below 0.1°C per unit SAR. The temperature difference between sham and exposed cells was less than 0.1°C. The absolute uncertainty of the SAR was 20%, and the variation due to the nonuniformity was 29%. The temperature remained at 36.64 ± 0.12°C during the period of measurement, ensuring no thermal effects.
Mess- und Berechnungsdetails
The system was characterized using an FDTD simulation program, and the results were verified by Schuderer et al.  using a DASY3 near-field scanner equipped with dosimetric field and temperature probes.
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