Question

A radioactive source activity has a unit measurement. What is it?

Answer 1

Units of Radioactivity. The number of decays per second, or activity, from a sample of radioactive nuclei is measured in becquerel (Bq), after Henri Becquerel. One decay per second equals one becquerel. An older unit is the curie, named after Pierre and Marie Curie

Answer 2

Units of Radioactivity and Dose. The original unit for measuring the amount of radioactivity was the curie (Ci)–first defined to correspond to one gram of radium-226 and more recently defined as: 1 curie = 3.7x1010 radioactive decays per second [exactly]. 1 becquerel = 1 radioactive decay per second = 2.703x10-11 Ci