The exposure system [Schonborn et al., 2000] located inside an incubator consisted of two 128.5 x 65 x 424 mm³ brass single-modewaveguide 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.
The temperature of the monolayercells was uniformly distributed without localized "hot spots". The increase in temperature due to the RFEMF was well below 0.1°C per unit SAR. The temperature difference between sham and exposedcells 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.
Measurement and calculation details
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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