Lack of promoting effects of chronic exposure to 1.95-GHz W-CDMA signals for IMT-2000 cellular system on development of N-ethylnitrosourea-induced central nervous system tumors in F344 rats
[Ausbleiben promovierender Wirkungen einer chronischen Exposition mit 1.95-GHz W-CDMA-Signalen des IMT-2000 Mobilfunk-Systems auf die Entwicklung N-Ethylnitrosoharnstoff-induzierter Tumoren des Zentralnervensystems bei F344 Ratten]
Shirai T, Ichihara T, Wake K, Watanabe S, Yamanaka Y, Kawabe M, Taki M, Fujiwara O, Wang J, Takahashi S, Tamano S
Abstand zw. exponiertem Objekt und Expositionsquelle
The exposure apparatus was the same as applied for the experiment with 1.439-GHzEMF [Shirai et al., 2005], except for the length of the monopole antenna. The exposure box was 90 x 90 x 60 cm, the inside walls except for the ceiling being covered with electromagnetic absorber.
Ten rats were fixed individually in plastic tubes of four different sizes (ID: 4.0, 4.7, 5.5, and 6.2 cm) and placed on disk-shaped plates like a carousel with their noses at 30 mm from a resonant monopole antenna at the center. Each plate was 65 cm in diameter, with adjustable height supported by a center hollow cylinder pole, and the distance between the ceiling and the rat backs was 5 mm.
All exposure conditions such as input power level and temperature were controlled with a computer system and checked daily.
Mess- und Berechnungsdetails
SAR distributions in rats were evaluated by numerical dosimetry with the FDTD method using different sized rat models [Shirai et al., 2005]. Three original rat models were based on X-ray computed tomography data of 126, 263, and 359 g rats in plastic holders, and other sized models were created by numerical scaling.
Shirai T et al.
Chronic exposure to a 1.439 GHz electromagnetic field used for cellular phones does not promote N-ethylnitrosourea induced central nervous system tumors in F344 rats