Definitions for "Specific activity"
The number of radioactive decays that take place per unit mass. In general this means that a low specific activity material releases a relatively small amount of radiation. Back to The Nuclear Fuel Cycle.
A measure of the radioactivity of a unit weight (generally one gram) of material.
The total radioactivity of a given nuclide per gram of an element. This is a measure of the concentration of radioactivity. Specific activity can be expressed as µCi/gram, Bq/L, etc.