specific activity (radionuclide)

of a radionuclide
symbol: $A_{\rm{S}}(\rm{R})$

https://doi.org/10.1351/goldbook.08763

Activity of a specified radionuclide ($\ce{R}$) per unit mass of that nuclide.

Note:
If the term 'specific activity' is used without qualification, it should be made clear whether it is of a material or of a radionuclide. See: specific activity of a radionuclide in a material.

Example:
Specific activity of tritium ($\ce{^{3}H}$) is $\pu{3.57E17 Bq kg-1}$ ($\pu{9.65 Ci mg-1}$).

Source:
PAC, 2021, 93, 69. 'Vocabulary of radioanalytical methods (IUPAC Recommendations 2020)' on page 103 (https://doi.org/10.1515/pac-2019-0302)