decay rate

in atmospheric chemistry
https://doi.org/10.1351/goldbook.D01541
The rate at which a pollutant is removed from the atmosphere either by reaction with reactive transient species such as the HO radical, O3, etc., by photodecomposition initiated by light absorption by the impurity, or by loss at the surface of aerosols, the earth, etc. The decay rate as applied to @[email protected] materials is related to the @[email protected] half-life (\(t_{1/2}\)) of the particular isotopic species A and its concentration \([A]_{t}\), at the given time (\(t\)): \[\text{Rate}=\frac{[A]_{t}\ \ln 2}{t_{1/2}}\]
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2183 [Terms] [Paper]