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Conclusions
Very few studies have been performed on the responses of organs and tissues to electromagnetic fields in the low-frequency or ultra-high-frequency ranges used by GWEN transmitters, but it is possible to conclude from the analysis presented here that effects of RF radiation are unlikely to occur at the power densities and absorbed energies associated with GWEN fields. The possible existence of nonthermal effects—such as the reported effects of low-intensity, amplitude-modulated RF fields on Ca2+ binding in nerve tissue—do not alter that conclusion, in that the waveforms and frequency spectra of these fields are different from those of the GWEN fields. Physiologic effects of ELF fields—with frequencies less than one five-hundredth those of GWEN fields—are generally associated with high field intensities and large induced-current densities in tissue. Some physiologic effects of ELF fields that might result from low induced current in tissue, such as alterations in pineal melatonin concentration, have not been shown to pose a direct risk to human health. In sum, studies on physiologic effects of ELF fields have yielded little evidence that exposure to the low-frequency fields from GWEN antennae in areas of most likely public access would represent a health risk.
