Non-ionizing Radiations

Non-ionizing radiation includes ultraviolet and visible light, infra-red, microwave and radio frequency radiation. Ultrasound in air or water may also be considered a form of non-ionizing radiation. The principal effect on man is general or localized heating. The detail of tissue damage is very different for the different kinds of radiation. Some special effects of these radiations are described. All forms of non-ionizing radiation are used industrially and also therapeutically. Fortunately man can often perceive at least a part of the power of non-ionizing radiation as the sensation of heat and can sometimes move away before injury occurs.