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In a frequency range between 100 kHz and 10 GHz the specific absorption rate (SAR) is commonly used to describe the energy of the electromagnetic field that is absorbed in biologicaltissue and there mainly converted into heat. The SAR is given in watts per kilogram of tissue (W/kg) and averaged over six minute exposure intervals in appropriate measurements or simulations. During this interval, a balance between the energy input and the heat dissipation in the tissue has been reached. By averaging over different body masses a distinction between the exposure of the whole body or parts of the body (e.g. the eye only) can be made.