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In contrast, visible light and longer-wavelength electromagnetic radiation, such as infrared, microwaves, and radio waves, consists of photons with too little energy to cause damaging molecular excitation, and thus this radiation is far less hazardous per unit of energy.
Although RF-coils transmit electromagnetic radiation in the range of radio waves, the emitted MR signal is not itself a conventional radio wave. (See the excellent but highly technical discussion in Hoult DI. The origins and present status of the radio wave controversy in NMR.