Experimental system for the study of multi-frequency dosimetry

Multiple simultaneous exposures to electromagnetic signals from various sources (multiple frequencies with high bandwidth) are a reality of daily life. In this study we investigated the non-thermal SAR (Specific Absorption Rate) for in vivo rats exposed to multiple electromagnetic (EM) field signals at 900 and 2450 MHz and 2 W power. The experimental system (ES) consisted of two vector signal generators, a directional coupler, a spectrum analyzer, a signal mixer, a power meter, and the GTEM chamber where the animal was located, immobilised in a rat holder. The 1g mean SAR values in the different anatomical regions of the nervous system and whole body of the rat were estimated from experimental power measurements, with the aid of an FDTD software tool. These new radiation protocols can be used to investigate biological effects of radiation on small animals.