becquerel

The International System unit of radioactivity, equal to one nuclear decay or other nuclear transformation per second.

Family of French physicists, including Antoine César (1788-1878), one of the first investigators of electrochemistry; his son Alexandre Edmond (1820-1891), noted for his research on phosphorescence and spectroscopy; and his grandson Antoine Henri (1852-1908), who shared a 1903 Nobel Prize for fundamental work in nuclear physics.