02572 IUPAC Gold Book - gain 10.1351/goldbook.G02572 G02572 current quantity 1 The gain of a photomultiplier is given by the equation \(G=k\ \sigma ^{n}\), where \(k\) is the efficiency of collection of photoelectrons on the first dynode, \(\sigma \) is the secondary emission ratio, i.e. the number of secondary electrons emitted for each electron incident on the dynode and \(n\) is the number of dynodes. collection https://goldbook.iupac.org//terms/view/C01148 photomultiplier https://goldbook.iupac.org//terms/view/P04626 PAC, 1995, 67, 1745. 'Nomenclature, symbols, units and their usage in spectrochemical analysis-XI. Detection of radiation (IUPAC Recommendations 1995)' on page 1753 (https://doi.org/10.1351/pac199567101745) https://goldbook.iupac.org/terms/view/G02572/html https://goldbook.iupac.org/terms/view/G02572/json https://goldbook.iupac.org/terms/view/G02572/plain Citation: 'gain' 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.G02572 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. 2026-04-27T14:55:53+00:00