Measured background levels of EMF were 0.22 V/m and 0.0001 mW/cm².
Measurement and calculation details
The FDTD method was used to calculate the SAR. The simulation was performed using Finite Integration Technique (FIT) which in the time domain case is similar to FDTD. The FCC recommended parameters for average muscledielectric constant and conductivity at 900 MHz were used to simulate the rat model which was an ellipsoid with 100 mm and 28 mm semi axis. The phone model was a metallic box of 90 mm x 40 mm x 15 mm mounted with a monopole antenna of 80 mm. Distance between the rat model and the phone model was 5 mm. Taking into account the very simple shape of the model used in this simulation, the SAR values are approximate. In addition, due to the adaptivepower control of the base station, the radiated power was variable during the study. Therefore, minimum and maximum SAR levels were measured. Average electric field and power density were measured by a radiation meter. An equipment called ''cellsensor'' was used for checking the availability of the signal.
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