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curie, Ci
1. The basic unit of radioactivity.
Named after Marie Curie, it is equal to the radioactivity emitted by a gram of radium, or 37 billion disintegrations per second. The Three Mile Island nuclear accident released about 50 curies.
2. A former unit of radioactivity, equal to 3.7 x 1010 becquerels (radioactive disintegrations).One gram of radium has a radioactivity of about one curie.
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