This study was conducted to evaluate the effects of both types presented mobile phone electromagnetic fields, 1950 MHz UMTS and pulsed 900 MHz GSM, on event related potentials and cognitive function in human.
15 healthy, right handed, male subjects (aged between 20-35 years) participated. Each subject performed five sessions at 1-week intervals, each at the same day and the same time.
The maximal spatial peak specific absorption rate did not exceed one half of the value of 2 W/kg proposed by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) as the limit for localized exposure.
Each subject performed one training and four exposure sessions at 1-week intervals, each at the same day and time. Computer controlled EMF or sham exposure was applied in a double-blind randomized crossover design.
Frequency | 0.9 GHz |
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Type | |
Exposure duration | continuous for about 30 min |
Exposure source | |
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Chamber | The recording area was shielded with EMF radiation absorbers, separated by a curtain, dimly lit, and supplied with fresh air. After fixation of the electrodes on the scalp, subjects were seated on a comfortable chair in front of a table with a chin support at a distance of 70 cm to a screen. |
Setup | Subjects were exposed by a small broadband antenna placed like a mobile phone directly over the left ear. |
Sham exposure | A sham exposure was conducted. |
Additional info | The RF or sham exposure period was preceded by 4 min and followed by 6 min of recording under sham exposure. |
Measurand | Value | Type | Method | Mass | Remarks |
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SAR | 1 W/kg | maximum | - | 10 g | spatial peak in the head |
Not any evidence for a deleterious effect of the electromagnetic fields on healthy mobile phone users was found.
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