11.43 x 22.45 cm, mounted at the top of the chamber
Distance between exposed object and exposure source
A small anechoic chamber made of 1.22 x 1.22-m plywood sheets and lined with MW absorbent pyramids was circulated via a closed-loop Styrofoam duct by warmed air maintained at 37.4 ± 0.2°C.
Two sealed thin-walled cellulosenitrateculture tubes (1.6 x 10 cm) containing 12 ml of culture medium were positioned horizontally 6.7 cm apart in the Styrofoam air duct parallel to the E field and equidistant from the antenna by means of a holder (10.2 x 12.6 cm) made of 1-mm balsa sheets with a series of criss-crossed air diffuser vanes.
The average of power density values measured was about 6% higher than those calculated.
Measurement and calculation details
Power density was calculated from geometry and forward and reflected powers measured by power meters via a dual directional coupler. A broadbandradiation meter was used to measure the uniformity of the field. SAR was determined by two methods, one using temperature probes and 60-s decay curves and the other involving Dewar calorimetry [Durney et al., 1980].