parallel plate RF resonator, 6 cm long, 5 cm wide and 2.4 cm apart
The exposure cell consisted of a plastic standard tissue culture flask of 25 cm² that was placed within a parallel plate RF resonator fed by a coaxial cable through a tapered transition section.
The sham exposed sample was placed in the same incubator, at a different height level, with a metal plate between the two samples. An additional control flask was grown in a different incubator which was set to 37 °C.
Since the exposure was not evenly distributed over the whole range, the samples were subdivided into four groups according to their average SAR level.
Mess- und Berechnungsdetails
The RF power feeding the exposure cell was coupled by a directional coupler to an RF detector. The distribution of power density and SAR inside the exposure cell (including the incubator's wall effect) was computed by a finite element (HFSS) simulation code with a mesh resolution of ~1/6 of the wavelength in each medium and an accuracy estimated to be ±5%. For a 1 W input power computation, the maximum SAR in the culture is 24 W/kg, whereas the average power density is 9.4 W/kg. Results were supported by extensive temperature measurements.
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