Study type: Medical/biological study (experimental study)

Absence of short-term effects of UMTS exposure on the human auditory system. med./bio.

Published in: Radiat Res 2010; 173 (1): 91-97

Aim of study (acc. to author)

To study the potential effects of UMTS exposure at a high specific absorption rate (far above the level usually associated with emissions of commercially available cell phones) on the human auditory system.

Background/further details

The procedure was conducted twice in a double-blind design on separate days: once with a real exposure and once with a sham exposure.
A total of 73 participants (38 women and 35 men) were tested across different European laboratories. Not all participants were given all audiological tests.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 1,947 MHz
Exposure duration: continuous for 20 min
  • SAR: 1.75 W/kg maximum (1 g) (at 2 cm depth from the phantom's shell surface)
  • SAR: 3.75 W/kg (skin level at the pinna)
  • SAR: 2 W/kg maximum (10 g) (brain tissue)

Exposure 1

Main characteristics
Frequency 1,947 MHz
Type
Exposure duration continuous for 20 min
Exposure setup
Exposure source
Setup 7 mm thick single-sided round dual band patch antenna with a diameter of 31 mm encapsulated in a 40 mm diameter, 7 mm thick transparent plastic capsule with Styrofoam insulation, connected to a Nokia 6650 UMTS mobile phone; antenna mounted on a plastic head set in a position similiar to the normal use of a mobile phone
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
SAR 1.75 W/kg maximum measured 1 g at 2 cm depth from the phantom's shell surface
SAR 3.75 W/kg - estimated - skin level at the pinna
SAR 2 W/kg maximum measured 10 g brain tissue

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • before exposure
  • after exposure

Main outcome of study (acc. to author)

The data showed no evidence of adverse effects on the audiological measures for short-term exposure (20 minutes) at a maximum SAR of 1.75 W/kg at 1947 MHz.

Study character:

Study funded by

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