Die Ratten (24 pro Gruppe) wurden täglich bis zum Alter von 8 Wochen exponiert. Zu diesem Zeitpunkt wurden dann 6 Ratten aus jeder Gruppe histologisch untersucht, um mögliche Veränderungen der Gehirn-Morphologie zu bewerten. Die verbliebenen 18 Ratten pro Gruppe wurden für 4 weitere Wochen einer Reihe von Verhaltens-Tests unterzogen.
The exposure system used earlier [Heikkinen et al., 2006] was modified so that it consisted of only three chambers for sham, low dose and high dose exposure. The chambers consisted of two parallel circular aluminium plates (152 cm in diameter and 15 cm apart) short-circuited at the edges with RF-absorbing material attached inside to reduce reflections.
Twenty-four rat cages made of polycarbonate were placed symmetrically around the antenna near the edge of each chamber. The rats could move freely in their cages. Only eight rats (one rat in every third cage) were placed in each chamber, and cylindrical homogeneous flask phantoms (110 ml) were placed in the empty cages.
The whole-body-averaged SARs were averaged over the pulse frame of the GSMsignal. Due to the movement of the rats in their cages, the SAR could vary momentarily from 0.07 W/kg to 1.2 W/kg in the low-dose group and from 0.7 W/kg to 12 W/kg in the high-dose group.
Mess- und Berechnungsdetails
The SAR determinations of the previous study [Heikkinen et al., 2006] were used for tuning the input RF power to produce a constant SAR for growing rats. They were verified with an FDTD method using numerical models of a young (156 g) and an adult (365 g) rat in the most common position in the cage observed during the previous study. Calculations were validated with calorimetric measurements of homogeneous flask phantoms simulating rats weighing 56 g and 110 g. Results obtained also confirmed the dependence of the SAR on animal weight.
Heikkinen P et al.
No effects of radiofrequency radiation on 3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone-induced tumorigenesis in female Wistar rats.
Li M et al.
Elevation of plasma corticosterone levels and hippocampal glucocorticoid receptor translocation in rats: a potential mechanism for cognition impairment following chronic low-power-density microwave exposure.
Kim TH et al.
Local exposure of 849 MHz and 1763 MHz radiofrequency radiation to mouse heads does not induce cell death or cell proliferation in brain.