Claim: Activity refers to the activity per quantity of a radionuclide and can be measured in becquerel, curie, or rutherford.
Evidence: Specific activity is the activity per quantity of a radionuclide and is a physical property of that radionuclide. rutherford per gram, curie per gram Activity is a quantity related to radioactivity, for which the SI unit is the becquerel (Bq), equal to one reciprocal second. 
becquerel curie rutherford Activity (A) Specific activity is the activity per quantity of a radionuclide and is a physical property of that radionuclide. Activity is a quantity related to radioactivity, for which the SI unit is the becquerel (Bq), equal to one reciprocal second.