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The rate at which unstable nuclei decay in a radioactive source.

The rate at which unstable nuclei in a radioactive source decay, measured in becquerels (Bq).

The number of radioactive decays occurring per second in a sample, measured in becquerels (Bq). One becquerel means one decay per second.

The number of nuclear decays occurring in a radioactive source per unit time.

The rate at which unstable nuclei in a radioactive source decay, measured as the number of decays per second.

The number of radioactive decays per second in a source, measured in becquerels (Bq).

The number of radioactive decays in a source per second, measured in becquerels (Bq).

The number of radioactive decays each second, measured in becquerels (Bq).

The number of nuclear decays occurring each second, measured in becquerels (Bq).

The rate at which unstable nuclei decay in a radioactive source, measured in becquerels (Bq). One becquerel is one decay per second.

The number of radioactive decays occurring in a source each second.