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GCIDE (0.00 / 0 votes) Rate this definition: ionize (v. t.). To convert (an atom or molecule) into ions, e. g. by dissolving in water, by reaction with acid or alkali, or by interaction with ionizing radiation.
Ionizing radiation, also (imprecisely) called radioactivity, is electromagnetic ( EM ) radiation whose waves contain energy sufficient to overcome the binding energy of electron s in atom s or molecule s, thus creating ion s. The wavelength is shorter than that of ultraviolet ( UV ). Ionizing radiation can occur as a barrage of photon s having a nature similar to that of visible light, but with far shorter wavelength and consequently higher frequency . This type of radiation includes X rays and gamma rays.