Curies (nuclear physics concept)

In nuclear physics, a curie (Ci) is a unit of radioactivity that measures how many atoms of a radioactive substance decay each second. Specifically, one curie equals 37 billion (3.7 × 10¹⁰) disintegrations per second. It helps quantify the intensity of radioactive materials. Named after Marie and Pierre Curie, it provides a way to compare how active different radioactive sources are. For example, a higher number of curies means more frequent atomic decays, indicating a more radioactive substance.