Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The curie (symbol Ci) is a unit of radioactivity, defined as 1 Ci = 3.7x1010 decays per second or becquerels. This is roughly the activity of 1 gram of the radium isotope 226Ra, a substance studied by the pioneers of radiology, Marie and Pierre Curie, for whom the unit was named. The curie has since been replaced by an SI derived unit, the becquerel (Bq), which equates to one decay per second.

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