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Electromagnetic radiation is emitted by many natural and man-made sources and is a fundamental
aspect of our lives. We are warmed by electromagnetic radiation emitted from the sun and our
eyes can detect the visible light portion of the electromagnetic spectrum. Radiofrequency (RF)
fields fall within a portion of the electromagnetic spectrum with frequencies ranging from 3 kHz
to 300 GHz, below that of visible light and above that of extremely low frequency electromagnetic
fields. RF fields are produced by many man-made sources including cellular (mobile) phones and
base stations, television and radio broadcasting facilities, radar, medical equipment, microwave
ovens, RF induction heaters as well as a diverse assortment of other electronic devices within our
living and working environments.
