{"term":{"id":"00087","title":"actinometer","longtitle":"IUPAC Gold Book - actinometer","doi":"10.1351\/goldbook.A00087","code":"A00087","status":"current","definitions":[{"id":1,"text":"A chemical system or physical device which determines the number of photons in a beam integrally or per unit time. This name is commonly applied to devices used in the ultraviolet and visible wavelength ranges. For example, solutions of iron(III) oxalate can be used as a chemical actinometer, while bolometers, thermopiles, and photodiodes are physical devices giving a reading that can be correlated to the number of photons detected.","links":[{"term":"chemical actinometer","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/C01016"},{"term":"photons","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/P04627"},{"term":"reading","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/R05189"},{"term":"ultraviolet","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/UT07492"},{"term":"visible","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/VT07496"},{"term":"wavelength","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/W06659"}],"sources":["PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2227 (https:\/\/doi.org\/10.1351\/pac199668122223)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/A00087\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/A00087\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/A00087\/plain"},"citation":"Citation: 'actinometer' 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.A00087","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.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","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.","accessed":"2026-04-17T18:22:59+00:00"}}