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depth of penetration
of light
The inverse of the absorption coefficient. If the decadic absorption coefficient, Math - text, is used, the depth of penetration (Math - ei) is the distance at which the radiant power, Math - text, decreases to one tenth of its incident value, Math - text. If the Naperian absorption coefficient, Math - text, is used, the depth of penetration (Math - ei in this case) is the distance at which the radiant power decreases to Math - ei 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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Cite as: IUPAC Compendium of Chemical Terminology, Electronic version, http://goldbook.iupac.org/D01605.html.
Transformed and rewritten from PDF version (entry http://www.iupac.org/goldbook/D01605.pdf)
by: Miloslav Nic, Jiri Jirat, Bedrich Kosata, ICT Prague, Czech Republic
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