decay curve

https://doi.org/10.1351/goldbook.D01539
A graph showing the relative amount of radioactive substance remaining after any time interval.
Source:
PAC, 1994, 66, 2513. 'Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)' on page 2518 (https://doi.org/10.1351/pac199466122513)