Curie
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2008-07-10T20:30:56Z
Barak Sh
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{{other uses}}
The '''curie''' (symbol '''Ci''') is a unit of [[Radioactive decay|radioactivity]], defined as
: 1 Ci = 3.7×10<sup>10</sup> [[radioactive decay|decays]] per [[second]] or [[becquerel]]s.
This is roughly the activity of 1 [[gramme]] of the [[radium]] [[isotope]] <sup>226</sup>Ra, a substance studied by the pioneers of [[radiology]], [[Marie Curie|Marie]] and [[Pierre Curie]]. The curie has since been replaced by an [[SI derived unit]], the [[becquerel]] (Bq), which equates to one decay per second. Therefore:
: 1 Ci = 3.7×10<sup>10</sup> Bq
and
: 1 Bq = 2.70×10<sup>−11</sup> Ci
The unit is named after [[Pierre Curie|Pierre]] and/or [[Marie Curie]]<ref>http://www.britannica.com/eb/article-9028251/curie#245574.hook</ref><ref>{{cite web
| author = Paul W. Frame
| title = How the Curie Came to Be
| url = http://www.orau.org/ptp/articlesstories/thecurie.htm
| accessdate = 2008-04-30}}</ref>
==References==
{{reflist}}
<!--Categories-->
[[Category:Units of radioactivity]]
[[Category:Radioactivity]]
[[Category:Non-SI metric units]]
{{chem-stub}}
{{phys-stub}}
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