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===Applications===
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|[[File:SmokeDetector.png|center|500px]]
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| style="height:20px; width:500px; text-align:center;" |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]].
When smoke gets between the [[electrode]]s the [[ion]]s become stuck in large [[particle]]s of [[soot]] preventing them from moving. This stops the [[Electrical Current|current]] in the [[circuit]].
The [[ammeter]] in the [[circuit]] is connected to an alarm which goes off when there is no [[Electrical Current|current]].
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