- In nuclear sciences and technologies, "activity" is the SI quantity related to the phenomenon of natural and artificial radioactivity (the SI unit of "activity" is becquerel, Bq, while that of "specific activity" is Bq/kg). For its use in radiochemistry, see radioactivity. ...
- A measure of the radioactivity of a unit weight (generally one gram) of material.
- The number of atoms of a radioactive substance that disintigrate per unt time per unit mass of a radioisotope.
- symbol S A number of decays per second per amount of substance. (The "amount of substance" can be the unit of either mass or volume.)
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