generic UMTS (WCDMA) test signal [Ndoumbe Mbonjo Mbonjo et al., 2004] including low frequency components of 1500 Hz, simulating power control, and 8-12 Hz, simulating 30 dB power variation due to fading
Each subject participated in three testing sessions held at the same time in the afternoon of three separate working days between 10 and 12 days apart. Each testing session consisted of the same four tests done three times under the different exposure levels (high, low, and sham). After each individual test, the participants left the exposure cabin for a standardized break of 3 min. The orders of both the tests and the exposure levels were chosen pseudo-randomly and double-blinded by the control software. Over all three sessions, the duration of exposure was approximately the same for all subjects.
Indicated above are the resulting peak spatial average exposure values in the cortex of the left temporal lobe of the brain in the high exposure condition. Low exposure was one tenth of high exposure, and sham was at least 50 dB below low exposure. Background ambient field strengths measured in the frequency range from DC up to 18 GHz were found to be negligible (max. values, e.g., 50 Hz: 3 V/m, 35 nT; 72 Hz: 1 V/m, 240 nT; 92.5 kHz: 100 nT).
Mess- und Berechnungsdetails
Forward and reverse powers were continuously recorded every 30 s. A detailed dosimetric analysis was performed by computations (including a thorough uncertainty analysis) using an anatomical numerical head model based on the Visible Human dataset and compared to measurements using a homogeneous specific anthropomorphic mannequin (SAM) head phantom which is routinely used in mobile phone compliance testing. Both methods showed a good agreement within ±10% in terms of the maximum 1 and 10 g averaged SAR [Schmid et al., 2005].
Eltiti S et al.
Short-term exposure to mobile phone base station signals does not affect cognitive functioning or physiological measures in individuals who report sensitivity to electromagnetic fields and controls.