Specific absorption rate

The specific absorption rate (SAR) describes the energy taken up by the body in the high-frequency field per kilogram body weight in a certain time and which is mainly transformed into heat, its measure is Watt per kilogram (W/kg). The SAR is averaged over 6 minutes time of affect, then a balance has formed through heat regulation of the body between heat input and heat output. Prior to this the increase in body temperature is only determined by the energy taken up. By averaging over different mass areas it is differentiated between affects on the whole body and affects on smaller tissue areas. For example, when averaging over 10 g of body tissue (which corresponds to the mass of the eye) the inhomogeneous energy distribution in the near field area of antennae is taken into account (e. g. when using mobile phones).