Study type: Medical/biological study (experimental study)

The identification of an intensity 'window' on the bioeffects of mobile telephony radiation. med./bio.

Published in: Int J Radiat Biol 2010; 86 (5): 358-366

Aim of study (acc. to editor)

To study whether the recorded window effect (decreased reproductive capacity of insects) of a previous study (see Panagopoulos 2010) was due to the fact that the wavelengths of 900 MHz and at 1800 MHz were as long as the distances from the antenna (33 cm and 17 cm, respectively) where the window effect appeared (30 cm for 900 MHz and 20 cm for 1800 MHz) or due to the power density of 10 µW/cm².

Background/further details

One group of insects was exposed to 900 MHz or 1800 MHz at 30 or 20 cm distances, respectively, from the antenna of a mobile phone. Another group was exposed at 8 or 5 cm, respectively, behind a metal grid, shielding both microwave irradiation and the extremely low frequency electric and magnetic fields for both types of irradiation in a way that field intensities were roughly equal between the two groups.
Five identical experiments were performed. Each group consisted of ten female and ten male newly emerged flies kept in separate vials for the first 48 h. After the 48 h, when both males and females of each group were sexually mature, they were put together (10 pairs) in another glass vial and they were allowed to mate and lay eggs for the next 72 h.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 900 MHz
Exposure duration: continuous for 6 min/day on 5 days
Exposure 2: 1,800 MHz
Exposure duration: continuous for 6 min/day on 5 days
Exposure 3: 900 MHz
Exposure duration: continuous for 6 min/day on 5 days
Exposure 4: 1,800 MHz
Exposure duration: continuous for 6 min/day on 5 days

Exposure 1

Main characteristics
Frequency 900 MHz
Type
Exposure duration continuous for 6 min/day on 5 days
Exposure setup
Exposure source
Setup a dual band GSM mobile phone in speaking mode was used at a distance of 30 cm
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.89 W/kg maximum - - manufacturer's information for the human head
power density 10 µW/cm² - measured - +/- 3 µW/cm²
electric field strength 0.61 V/m average over time measured - +/- 0.11 V/m ELF field
magnetic flux density 0.01 µT average over time measured - +/- 0.002 µT ELF field

Exposure 2

Main characteristics
Frequency 1,800 MHz
Type
Exposure duration continuous for 6 min/day on 5 days
Exposure setup
Exposure source
Setup a dual band GSM mobile phone in speaking mode was used at a distance of 20 cm
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.89 W/kg maximum - - manufacturer's information for the human head
power density 11 µW/cm² - measured - +/- 3 µW/cm²
electric field strength 0.6 V/m average over time measured - +/- 0.13 V/m ELF field
magnetic flux density 0.009 µT average over time measured - +/- 0.003 µT ELF field

Exposure 3

Main characteristics
Frequency 900 MHz
Type
Exposure duration continuous for 6 min/day on 5 days
Exposure setup
Exposure source
Setup a dual band GSM mobile phone in speaking mode was used at a distance of 8 cm behind a ferromagnetic shielding grid
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.89 W/kg maximum - - manufacturer's information for the human head
power density 10.1 µW/cm² - measured - +/- 2.8 µW/cm²
electric field strength 0.65 V/m average over time measured - +/- 0.1 V/m ELF field
magnetic flux density 0.012 µT average over time measured - +/- 0.003 µT ELF field

Exposure 4

Main characteristics
Frequency 1,800 MHz
Type
Exposure duration continuous for 6 min/day on 5 days
Exposure setup
Exposure source
Setup a dual band GSM mobile phone in speaking mode was used at a distance of 5 cm behind a ferromagnetic shielding grid
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.89 W/kg maximum - - manufacturer's information for the human head
power density 10.8 µW/cm² - measured - +/- 3.2 µW/cm²
electric field strength 0.66 V/m average over time measured - +/- 0.12 V/m ELF field
magnetic flux density 0.013 µT average over time measured - +/- 0.002 µT ELF field

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

The decrease in the reproductive capacity did not differ significantly between the two exposure groups and the reproductive capacity of each exposed group was significantly decreased compared to the sham exposed group. Thus, this window effect is only indirectly related to the distance from the antenna; it does not seem to be related to the wavelength (or the frequency) of the irradiation. This "window" was directly dependent on the intensity of the field, no matter on which distance from the antenna this intensity exists.
The authors conclude that the bioactivity window effect seemed to be due to the intensity of the incident field (10 µW/cm², 0.6-0.7 V/m) at 30 or 20 cm from the GSM 900 or 1800 mobile phone antenna, respectively.

Study character:

Study funded by

Related articles