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|[[File:SmokeDetector.png|center|500px600px]]
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| style="height:20px; width:500px600px; text-align:centerleft;" |In a smoke detector [[Alpha Particle|alpha particles]] are released between two [[electrode]]s.
When the [[Alpha Particle|alpha particles]] [[Ionising Radiation|ionise]] the [[molecule]]s in the [[air]] the [[ion]]s move between the [[electrode]]s and a [[Electrical Current|current]] flows in the [[circuit]].