Definition / meaning of EMR

Radiation that has both electric and magnetic fields and travels in waves. It comes from natural and man-made sources. EMR can vary in strength from low energy to high energy. It includes radio waves, microwaves, infrared light, visible light, ultraviolet light, x-rays, and gamma rays. Also called electromagnetic radiation.

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The Web site of the National Cancer Institute (http://www.cancer.gov/)

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