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===Extra Information===
{{#ev:youtube|https://www.youtube.com/watch?v=KXzONBPcPIk}}
===References===
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Radioactive tracers, page 104, GCSE Physics, Pearson Edexcel '']