Abstand zw. exponiertem Objekt und Expositionsquelle
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).
Rats were placed close to a different antenna (in the same array) each day to ensure a uniform distribution of exposure. The antennas were rectangular loops printed on dielectric substrate using the coplanar line technique [Leveque et al., 2004].
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.
Mess- und Berechnungsdetails
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.