ELECTROMAGNETIC RADIATION — the electromagnetic waves which are let out in an expedited manner by the moving electric charges excited by atoms and molecules, radionuclides and other radiating systems. Depending on wavelength (or frequencies of fluctuations) distinguish gamma radiation (see), x-ray emission of km.), optical radiation (see. Infrared radiation, Light, Ultraviolet radiation), radio wave radiation (see. Electromagnetic field).
Range E. and. is ranging from< = 10^-10 m (gamma radiation) to 10 m and more (radio wave). For E. and. different ranges various sources of radiation, ways of registration, the mechanism of interaction with substance etc.
E are characteristic. and. has as wave (wavelength or frequency, the direction of distribution), and corpuscular (energy of quantum and an impulse) properties (see the Luminescence, the Molecule). Wave properties are shown in diffraction, an interference and polarization (see. Double refraction, Interference of waves, Optics), corpuscular — in photoeffect and Compton effect (see Fotosensibilization).
AA. and. finds broad application in various spheres of activity of the person including in medicine (see the Gamma therapy, Radiation therapy, the Roentgenotherapy, Phototherapy, UVCh-therapy).