specific activity, \(a\)

in radiochemistry
https://doi.org/10.1351/goldbook.S05790
For a specified isotope, or mixture of isotope, the activity of a material divided by the mass of the material.
Sources:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2515 [Terms] [Paper]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 993 [Terms] [Paper]