Medical/biological Study (experimental study)

No effects of short-term GSM mobile phone radiation on cerebral blood flow measured using positron emission tomography. med./biol.

PubMed Entry

Journal web site

Aim of study (according to author)
To study the effects of a pulse modulated GSM handset signal on cerebral blood flow, using three different mobile phone locations (left ear, right ear, forehead) to test for possible exposure effects on brain regions close to the exposure source.

Endpoint

• effects on the neurological system: regional cerebral blood flow

Exposure
General category: mobile communication system, digital mobile phone, GSM, PW (pulsed wave)

Field characteristics

Parameters

902.4 MHz pulsed (PW) exposure duration: 12 times 5 min (including sham exposure) with a 10 min interscan interval

power: 240 mW SAR: 1 W/kg average over mass (10 g) (phone at the right ear turned on - measured with the SAM phantom) SAR: 1.1 W/kg average over mass (10 g) (phone at the left ear turned on - measured with the SAM phantom) SAR: 1.4 W/kg average over mass (1 g) (phone at the right ear turned on - measured with the SAM phantom) SAR: 1.5 W/kg average over mass (1 g) (phone at the left ear turned on - measured with the SAM phantom) SAR: 27 mW/kg max value (brain) (spatial average when the phone at the forehead turned on) SAR: 12.8 mW/kg max value (brain) (spatial average when the phone at the left ear turned on) SAR: 17.4 mW/kg max value (brain) (spatial average when the phone at the right ear turned on)

Exposed system:
human
partial body exposure: eft ear, right ear, forehead

Methods
Endpoint/Measurement parameters/Methodology

• effects on the neurological system: regional cerebral blood flow (positron emission tomography while subjects performed a simple visual vigilance task (0-back task))
• thermoregulation: temperature of face skin and in the ear canals

Main outcome of study (according to author)
The mobile phone exposure induced a slight temperature rise in the ear canals, but did not affect brain hemodynamics and task performance. The data provided no evidence for acute effects of short-term mobile phone exposure on cerebral blood flow.

(Study character: medical/biological study, experimental study, full/main study, double-blind study)

Study funded by

• Tekes (National Technology Agency), Finland

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