The standardized exposure device has been described in [Sannino et al., 2006 and Calabrese et al., 2006]. Two identical waveguides, one for RF and one for sham exposure, were housed in a commercial incubator at 37°C with 95% air and 5% CO2.
The feeding end was a coaxial waveguide adapter, the other end terminated with a fixed short circuit. The center of the samples was at a distance of 0.5 λ from the short circuit in order to achieve the best trade-off between efficiency and SAR uniformity.
Incident and reflected powers were measured using a bidirectional powersensor connected to a computer continuously adjusting the power level of the signal generator to the required SAR. Measurements of local SAR and power efficiency showed good agreement with the calculated values. The ratio between the SARstandard deviation and the average SAR was 0.33 in all four samples. The measured increase in temperature during the RFexposure at 2 W/kg was 0.2 ± 0.1°C, which was considered sufficiently low to exclude damage induced by thermal processes.
Sannino A et al.
Evaluation of Cytotoxic and Genotoxic Effects in Human Peripheral Blood Leukocytes Following Exposure to 1950-MHz Modulated Signal