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]