Becquerel is the unit of measurement of Radioactivity.
Radioactivity was discovered by A. H. Becquerel (1896).
Radioactivity is defined as the spontaneous and continuous disintegration of a nucleus of a heavy element on its own with the emission of certain type of radiations is known as natural radioactivity.
One becquerel (1Bq) is equal to 1 disintegration per second.