08754 IUPAC Gold Book - prompt gamma-ray analysis 10.1351/goldbook.08754 08754 current initialism: PGA 1 Measurement principle in which gamma radiation emitted during the de-excitation of the compound nucleus formed by neutron capture is applied to measure the amounts of elements in a material. The measurement method is often denoted as prompt gamma-ray neutron activation analysis (PGNAA) or prompt gamma-ray activation analysis (PGAA), though the measurement method is not in agreement with the definition of activation analysis. The term prompt gamma-ray analysis (PGA) is therefore preferred. PAC, 2021, 93, 69. 'Vocabulary of radioanalytical methods (IUPAC Recommendations 2020)' on page 93 (https://doi.org/10.1515/pac-2019-0302) https://goldbook.iupac.org/terms/view/08754/html https://goldbook.iupac.org/terms/view/08754/json https://goldbook.iupac.org/terms/view/08754/plain Citation: 'prompt gamma-ray analysis' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.08754 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. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . 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. 2026-04-19T07:10:22+00:00