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*Indicates the rate at which a sample of [[radioactive]] [[material]] [[Decay (Physics)|decays]].
*Higher [[activity]] means more frequent emissions of [[radiation]].
*[[Activity]] decreases over [[time]] as the [[radioactive]] [[material]] [[Decay (Physics)|decays]].
*Related to the half-life of the [[radioactive]] [[isotope]], which is the [[time]] taken for half of the [[isotope]] to [[Decay (Physics)|decay]].
*[[Activity]] can also be [[measure]]d in [[curies]] (Ci), where 1 Ci = 3.7 x 10^10 disintegrations per [[second]].
*[[Activity]] is used in various applications including medical imaging, cancer treatment, and radiometric dating.
===Examples===