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| style="height:20px; width:200px; text-align:left;" |This [[diagram]] shows the number of [[Fermium]]-252 [[atom]]s halves each day, so the '''half life''' is 1 day.
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: The '''half life''' of an [[isotope]] can be found from plotting a [[graph]] of the amount or [[isotope]] or the [[Count Rate|count rate]] against the [[time]]. The '''half life''' is the time these take to halve from their initial value.
: The [[Count Rate|count rate]] of a sample of [[Unstable Isotope|unstable isotope]] can be predicted given its initial [[Count Rate|count rate]], its '''half life''' and the [[time]] it has been given.
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