Distance between exposed object and exposure source
The exposure system consisting of three distinct arrays of four loop antennas to expose 12 rats simultaneously was assembled in a wooden rack with RF absorbing panels on the four sides and between the levels [Galloni et al., 2005]. The arrays were used simultaneously, two for real and one for sham exposure, and were connected (blinded) to the MW generator through a black box.
Rats were individually restrained in cylindrical Perspex tubes with a cone-shaped head end. The antenna was held in contact with the tube perpendicular to the head surface over the right ear of the rat at a total distance of about 8-10 mm from the cochlea (localised exposure).
Since the rat could still make small movements, the SAR in the ear could vary (by less than 20%). Therefore, a periodic check of the rat's position was made by the operator to maintain the fixed exposure conditions.
Measurement and calculation details
Both numerical and experimental dosimetry were performed on the system and showed a good agreement (5.5 ± 1.0 W/kg and 4.42 ± 1.2 W/kg at 1 W input power) [Galloni et al., 2005]. The local SAR was measured at single points by inserting a fiberoptic probe in the cochlea of a rat's cadaver.
Galloni P et al.
Electromagnetic fields from mobile phones do not affect the inner auditory system of Sprague-Dawley rats.