Becquerel The becquerel (symbol Bq) is the SI derived unit of radioactivity, defined as the activity of a quantity of radioactive material in which one nucleus decays per second It is therefore equivalent to s 1 The older unit of radioactivity was theThe Becquerel a very small unit The becquerel, the commonlyused unit of activity, corresponds to a decay rate of one nucleus per second This unit on the scale of the atom is so small (and therefore illadapted to describe the activities of most radioactive substances we deal with) that multiples of becquerels are frequently used kiloOne Bq is defined as the activity of a quantity of radioactive material in which one nucleus decays per second SI uses the becquerel rather than the second for the unit of activity measure to avoid dangerous mistakes a measurement in becquerels is proportional to activity, and thus a more dangerous source of radiation gives a higher reading
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