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).
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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