Term: radiation https://doi.org/10.1351/goldbook.R05048 Definition: A term embracing electromagnetic waves as well as fast moving particles. In radioanalytical chemistry the term usually refers to radiation emitted during a nuclear process (radioactive decay, nuclear reaction, nuclear fission, accelerators). Related Terms: 1) radioanalytical chemistry (http://doi.org/10.1351/goldbook.A00338). 2) radioactive decay (http://doi.org/10.1351/goldbook.R05083). 3) nuclear fission (http://doi.org/10.1351/goldbook.N04229). Source: PAC, 1994, 66, 2513. 'Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)' on page 2523 (https://doi.org/10.1351/pac199466122513) Citation: 'radiation' 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.R05048 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.