A unit of radiation; the radiation produced by a gram of radium in one second. 1 Ci = 37 billion disintegrations per second (dps). Also, a quantity of radionuclide that decays at 37 billion dps.

TMI released about 5 curies; the 1949 Green Run at Hanford released about 11,000 curies. Named for Pierre Curie, husband of Marie Curie.

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