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: '''Geiger counters''' can give the total 'count' of [[Ionising Radiation|ionising]] [[particle]]s, which has not [[unit]]s or can [[Mean Average|average]] this over time to give a [[Count Rate|count rate]].
: '''Geiger counters''' often have a speaker so the detection of a single [[particle]] of [[Ionising Radiation|ionising radiation]] can be heard.
===References===
====OCR====
:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Geiger counters, pages 173,176, Gateway GCSE Physics, Oxford, OCR '']