Curie 155829 224878679 2008-07-10T20:30:56Z Barak Sh 7058953 {{other uses}} The '''curie''' (symbol '''Ci''') is a unit of [[Radioactive decay|radioactivity]], defined as : 1&nbsp;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 The curie has since been replaced by an [[SI derived unit]], the [[becquerel]] (Bq), which equates to one decay per second.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&nbsp;Ci = 3.7×10<sup>10</sup> Bq and : 1&nbsp;Bq = 2.70×10<sup>−11</sup>&nbsp;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}} {{measurement-stub}} <!--Interwiki--> [[be-x-old:Кюры (адзінка вымярэньня)]] [[bg:Кюри]] [[cs:Curie]] [[da:Curie]] [[de:Curie (Einheit)]] [[es:Curio (unidad)]] [[fr:Curie (unité)]] [[ko:퀴리]] [[is:Kúrí]] [[it:Curie]] [[he:קירי]] [[ms:Curie]] [[nl:Curie (eenheid)]] [[ja:キュリー]] [[no:Curie]] [[pl:Kiur (jednostka miary)]] [[pt:Curie]] [[ru:Кюри (единица измерения)]] [[simple:Curie (unit)]] [[sl:Kiri]] [[sv:Curie]] [[uk:Кюрі]]