The Becquerel reference article from the English Wikipedia on 24-Apr-2004
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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 the curie (Ci). 1 Bq = 2.7×10-11 Ci.

It was named after Henri Becquerel, who shared a Nobel Prize with Marie Curie for their work in discovering radioactivity.