absolute counting

in radioanalytical chemistry
https://doi.org/10.1351/goldbook.A00021
A measurement under such well-defined conditions that the @A00114@ of a sample can be derived directly from the observed @C01379@.
Source:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2517 [Terms] [Paper]