decay constant 

https://doi.org/10.1351/goldbook.D01538
Proportionality constant relating the activity of a @R05077@ substance, A, to the number of decaying particles B, \(N_{\text{B}}\), \(A=\lambda \ N_{\text{B}}\). @P04855@ of a @N04227@ within a time interval divided by that time interval. Synonymous with @D01786@.
Source:
Green Book, 2nd ed., p. 22 [Terms] [Book]
See also:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2518 [Terms] [Paper]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 968 [Terms] [Paper]
Citation: 'decay constant' 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.D01538 RIS BibTex EndNote
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Last revised: February 24, 2014