Term: radiation chemistry https://doi.org/10.1351/goldbook.R05050 Definition: The part of chemistry which deals with the chemical effects of ionizing radiation, as distinguished from photochemistry associated with visible and ultraviolet electromagnetic radiation. Related Terms: 1) ionizing radiation (http://doi.org/10.1351/goldbook.I03216). 2) photochemistry (http://doi.org/10.1351/goldbook.P04588). 3) visible (http://doi.org/10.1351/goldbook.VT07496). 4) ultraviolet (http://doi.org/10.1351/goldbook.UT07492). Source: Orange Book, 2nd ed., p. 236 (https://media.iupac.org/publications/analytical_compendium/) Citation: 'radiation chemistry' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.R05050 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.