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Ionizing electromagnetic radiation that can produce chemical changes, e.g., the damage done to skin by ultraviolet sunlight.
See also: radiation
Medical Dictionary, © 2009 Farlex and Partners
ac·tin·ic ra·di·a·tion(ak-tinik rādē-āshŭn)
Light radiation toward and beyond theviolet end of the spectrum.
Medical Dictionary for the Dental Professions © Farlex 2012