Term: thermal column https://doi.org/10.1351/goldbook.T06297 Definition: A large body of moderator, adjacent to or inside a reactor to provide thermal neutrons for experiments. Related Terms: 1) moderator (http://doi.org/10.1351/goldbook.M03961). 2) thermal neutrons (http://doi.org/10.1351/goldbook.T06307). 3) reactor (http://doi.org/10.1351/goldbook.N04239). Source: PAC, 1982, 54, 1533. 'Glossary of terms used in nuclear analytical chemistry (Provisional)' on page 1553 (https://doi.org/10.1351/pac198254081533) Citation: 'thermal column' 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.T06297 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.