Study type:
Medical/biological study
(experimental study)
No short-term effects of digital mobile radio telephone on the awake human electroencephalogram
med./bio.
By:
Roschke J, Mann K
Published in: Bioelectromagnetics 1997; 18 (2): 172-176
Aim of study (acc. to author)
Endpoint
Exposure
mobile communications
GSM
Exposure
Parameters
Exposure 1:
900 MHz
Exposure duration:
continuous for nearly 3.5 min
Frequency
900 MHz
Type
Exposure duration
continuous for nearly 3.5 min
Modulation type
pulsed
Pulse width
580 µs
Repetition frequency
217 Hz
Exposure source
Distance between exposed object and exposure source
40 cm
Chamber
The experimental sessions took place in a sound-proof electrophysiological laboratory.
Setup
The mobile phone was positioned at a distance of 40 cm from the vertex of the subject , comparable to normal use, and operated from an adjacent room.
Additional info
For each subject the EEG was registered in two 10 min duration periods separated by a 30 min break. Each EEG registration was subdivided into three successive segments, each consisting of 80 sweeps at 2.55 s duration. The first and the third segments served as controls during which the EMF was switched off. EMF was active during the second segment during one registration session and inactive during the other (randomized , single-blind).
Measurand
Value
Type
Method
Mass
Remarks
power
8 W
peak value
measured
-
-
power density
0.05 mW/cm²
mean
measured
-
at a distance of 40 cm
Extended view
Compact view
Methods
Endpoint/measurement parameters/methodology
Investigated system:
Investigated organ system:
Main outcome of study (acc. to author)
Study funded by
Deutsche Telekom/T-Systems, Germany
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