{"term":{"id":"01605","doi":"10.1351\/goldbook.D01605","code":"D01605","status":"current","longtitle":"IUPAC Gold Book - depth of penetration of light","title":"depth of penetration","termversion":"2.3.3","lastupdated":"2014-02-24","definitions":[{"id":"1","text":"The inverse of the absorption coefficient. If the decadic absorption coefficient, a, is used, the depth of penetration (1\/a) is the distance at which the radiant power, P λ, decreases to one tenth of its incident value, P λ 0. If the Naperian absorption coefficient, α, is used, the depth of penetration (1\/α = β in this case) is the distance at which the radiant power decreases to 1\/e of its incident value.","contexts":{"of":["light"]},"links":[{"title":"absorption coefficient","type":"internal","url":"https:\/\/goldbook.iupac.org\/terms\/view\/A00037"},{"title":"radiant power","type":"goldify","url":"https:\/\/goldbook.iupac.org\/terms\/view\/R05046"},{"title":"absorbance","type":"see","url":"https:\/\/goldbook.iupac.org\/terms\/view\/A00028"},{"title":"attenuance","type":"see","url":"https:\/\/goldbook.iupac.org\/terms\/view\/A00513"}],"math":[{"alttext":"a","latex":"a"},{"alttext":"1\/a","latex":"\\frac{1}{a}"},{"alttext":"P λ","latex":"P_{\\lambda }"},{"alttext":"P λ 0","latex":"P_{\\lambda }^{0}"},{"type":"symbol","alttext":"α","latex":"\\alpha "},{"alttext":"1\/α = β","latex":"\\frac{1}{\\alpha } = \\beta "},{"alttext":"1\/e","latex":"\\frac{1}{\\text{e}}"}],"sources":["PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2235 (https:\/\/doi.org\/10.1351\/pac199668122223)"]}],"referencedin":[{"title":"Wikipedia - Mathematical descriptions of opacity (en)","url":"https:\/\/en.wikipedia.org\/wiki\/Mathematical_descriptions_of_opacity"}],"links":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/D01605\/html","json":"https:\/\/goldbook.iupac.org\/terms\/view\/D01605\/json","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/D01605\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/D01605\/plain","pdf":"https:\/\/goldbook.iupac.org\/terms\/view\/D01605\/pdf"},"citation":"Citation: 'depth of penetration' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351\/goldbook.D01605","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":"2024-04-14T02:38:22+00:00"}}