. . "Bq" . "becquerel"@en . . "becquerel"@nl . . "The becquerel is a unit of activity defined as the activity of a quantity of radioactive material in which one nucleus decays per second. Algebraically it is defined as 1 divided by second."@en . "The becquerel is a unit of activity defined as the activity of a quantity of radioactive material in which one nucleus decays per second. Algebraically it is defined as 1 divided by second. The becquerel is a derived unit in the International System of Units." .