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Studies on Terrestrial Trunked Radio (TETRA)

BfS and the Federal Agency for Digital Radio of Security Authorities and Organisations (BDBOS) reached an agreement to pay adequate attention to basic requirements of radiation protection and to information and risk communication when setting up the new digital voice and data communication system for security authorities. The terms of condition are that BDBOS finances research projects aiming at clarifying open scientific questions for risk evaluation of the electromagnetic fields used for TETRA. Two research projects were carried out which are already completed.

Article Effects of the TETRA radio signal on cognitive functions

Several international studies on the influence of electromagnetic fields from mobile communications on cognitive performance and brain function during wakefulness and sleep have been performed during the last years. No health relevant effects were found below the maximum exposure of 2 Watt per kilogram (W/kg), which applies for the use of mobile devices by the public. In Germany, a new digital radio communication network for security authorities and organisations based on the TETRA standard is being set up at present. TETRA (Terrestrial Trunked Radio) uses a frequency band around 400 MHz and has been much less investigated than public mobile communications. Possible effects of electromagnetic fields of mobile TETRA devices on humans were investigated to further reduce scientific uncertainties concerning the impact of the digital radio for security authorities.

Article Modelling of the SAR-distribution within the whole body from TETRA terminals

The introduction of a nationwide digital radio system for security authorities and organisations changes the employees’ work-related exposure to electromagnetic fields. Powerful radio transmitters that operate in close contact to or very near to the human body at frequencies just below 400 MHz, is an exposure situation which was not studied in detail up to now from a radiation protection point of view. Primarily exposures at higher frequencies were studied in the German Mobile Telecommunication Research Programme (DMF), so that the transfer of results from the DMF to the expected exposure situations of employees of authorities and organizations with security tasks (BOS) is limited. The research projects aims at determining the exposure of users of radio transmitters that are applied in the digital BOS radio network in Germany.

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