Study type: Medical/biological study (experimental study)

Effects of mobile phone type signals on calcium levels within human leukaemic T-cells (Jurkat cells). med./bio.

Published in: Int J Radiat Biol 2001; 77 (12): 1207-1217

Aim of study (acc. to author)

To test whether exposure to simulated GSM mobile phone signals influences the concentration of calcium or calcium signalling patterns in a human lymphocyte cell line.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 915 MHz
Modulation type: pulsed
Exposure duration: continuous for 10 min
  • SAR: 2.1 W/kg maximum
  • SAR: 1.5 W/kg mean (weighted average)
  • SAR: 1 W/kg minimum
Exposure 2: 915 MHz
Modulation type: CW
Exposure duration: continuous for 10 min
  • SAR: 2.1 W/kg maximum
  • SAR: 1.5 W/kg mean (weighted average)
  • SAR: 1 W/kg minimum

Exposure 1

Main characteristics
Frequency 915 MHz
Type
Exposure duration continuous for 10 min
Modulation
Modulation type pulsed
Duty cycle 12.5 %
Repetition frequency 217 Hz
Exposure setup
Exposure source
  • modified coaxial line, see setup details
Chamber The RF exposure device was a modified coaxial line with a perfused cell chamber that was continuous with the inner conductor of the transmission line. The line was terminated in an electrical short consisting of a thin stainless steel shim. A round coverslip was inserted above the shim which also formed the floor of the cylindrical chamber. The cells were viewable through a small hole in the shim. The hole was small enough to provide shielding from electromagnetic scattering influence of the inverted microscope on which the RF exposure device was mounted.
Additional info Sham exposure took place under the same conditions and for the same amount of time.
Parameters
Measurand Value Type Method Mass Remarks
SAR 2.1 W/kg maximum measured - -
SAR 1.5 W/kg mean measured and calculated - weighted average
SAR 1 W/kg minimum measured - -

Exposure 2

Main characteristics
Frequency 915 MHz
Type
Exposure duration continuous for 10 min
Modulation
Modulation type CW
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
SAR 2.1 W/kg maximum measured - -
SAR 1.5 W/kg mean measured and calculated - weighted average
SAR 1 W/kg minimum measured - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

There is no clear indication that radiofrequency emissions from mobile phones are associated with any changes in calcium levels or calcium signalling in lymphocytes.

Study character:

Study funded by

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