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: The [[radioactivity]] of a [[material]] can be [[measure]]d using a [[Geiger Counter|Geiger counter]].
: [[Radioactive]] [[isotope]]s are [[Unstable Isotope|unstable isotopes]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Radioactive; half-life, pages 118-19, GCSE Physics; Student Book, Collins, AQA '']