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depth of penetration

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.
Source:
PAC, 1996, 68, 2223 (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2235
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: https://doi.org/10.1351/goldbook.D01605.
Original PDF version: http://www.iupac.org/goldbook/D01605.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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