Abstand zw. exponiertem Objekt und Expositionsquelle
A detailed description of the radial transmission line used for exposure has been reported in several publications [Moros et al., 1998 and 1999]. The RTL was formed by two horizontal parallel conductive plates, 43 mm apart. The 6 mm thick bottom AL plate was highly thermally conductive thus minimising temperature gradients among flasks. A central conical AL antenna emitted TEM waves propagating radially outward and terminated by an annulus of RF-absorbing foam material braced by a thin lamina of perforated aluminium at 533 mm from the centre.
A total of 16 T-75 culture flasks could be distributed angularly around the antenna with their centres located at a radius of 292 mm. The cell layer was between 247 and 338 mm from the centre. Each flask was dielectrically loaded with a 3 mm thick shim of alumina (Al2O3) in order to boost and homogenise the SAR distribution.
Cells in T-75 tissue culture flasks containing 40 ml of medium (height 5 mm) were exposed to RF radiation at 37°C or heat shock (2 h at 41°C or 30 min at 45°C). All heat shock and RF exposure conditions were analysed simultaneously along with a matched incubator control sample.
"The above power settings were selected to produce a nominal time-averaged cell-layer SAR of 5.0 ± 2.1 W/kg for both signals." (?!)
Mess- und Berechnungsdetails
This SAR value is based on a series of comprehensive measurements and includes variations due to the position of the flask but does not include potential measurement uncertainty usually estimated at ±10%. The degree of inhomogeneity (SD) is typical for this type of arrangement and has been validated by independent FDTD simulation studies [Pickard et al., 2000, publication 5405]. The larger than usual amount of medium was found to reduce the SAR non-uniformities.
Leszczynski D et al.
Non-thermal activation of the hsp27/p38MAPK stress pathway by mobile phone radiation in human endothelial cells: Molecular mechanism for cancer- and blood-brain barrier-related effects.
Fritze K et al.
Effect of global system for mobile communication microwave exposure on the genomic response of the rat brain.
Cleary SF et al.
Stress proteins are not induced in mammalian cells exposed to radiofrequency or microwave radiation.
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