But I disagree that the Bq is appropriate for this example; the becquerel quantifies radioactivity:
> The becquerel (symbol Bq) (pronounced: 'be-kə-rel) is the SI derived unit of radioactivity. One Bq is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. (https://en.wikipedia.org/wiki/Becquerel)