half-life, τ1/2

of a transient entity
https://doi.org/10.1351/goldbook.HT07391
Time needed for a concentration of the entity to decrease to 1/2 of its original value.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 349 [Terms] [Paper]
Citation: 'half-life' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.HT07391 RIS BibTex EndNote
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Last revised: February 24, 2014