What is Curie (unit)?
The '''curie''' (symbol '''Ci''') is a [[unit of measurement]]. It measures [[Radioactive decay|radioactivity]]. It is defined as : 1&nbsp;Ci = 3.7×10<sup>10</sup> [[radioactive decay|decays]] per [[second]]. This is roughly the activity of 1 [[gram]] of the [[radium]] [[isotope]] <sup>226</sup>Ra. Radium was studied by the pioneers of [[radiology]], [[Marie Curie|Marie]] and [[Pierre Curie]] so the unit is named after them. The curie has since been replaced by an [[International_System_of_Units#Derived units|SI derived unit]], the [[becquerel]] (Bq), which is decay per second. Therefore: : 1&nbsp;Ci = 3.7×10<sup>10</sup> Bq or 37 Gigabecquerel (Gbq) and : 1&nbsp;Bq = 2.70×10<sup>−11</sup>&nbsp;Ci In 1962, the International Commission on Radiological Units suggested the usage of this unit named after Marie Curie. [[Category:Old units of measurement]] [[Category:Units of radioactivity]] <!--Categories--> <!-- [[Category:Units of radioactivity]] [[Category:Radioactivity]] [[Category:Non-SI metric units]] --> {{sci-stub}}