|unit system||si derived unit|
|unit of||specific activity|
|named after||henri becquerel|
|1 bq in ...||... is equal to ...|
| rutherford|| 10−6 rd|
| curie|| 2.703×10−11 ci ≅ 27 pci|
| si base unit|| s−1|
the becquerel (/; symbol: bq) is the si derived unit of radioactivity. one becquerel is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. for applications relating to human health this is a small quantity, and si multiples of the unit are commonly used.
the becquerel is named after henri becquerel, who shared a nobel prize in physics with pierre and marie skłodowska curie in 1903 for their work in discovering radioactivity.