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when alpha particles are accelerated between the electrified parallel plates, a few electrons of charged particles are energised and then eject a flash of light on return to original energy level. the probability of this happening is random due to the narrow conditions necessary for such phenomenon.

ionising smoke detectors have a small [1 micro curie alpha source] that ejects alpha particles into an electric field. if the flow of alpha particles is prevented [by smoke particles], an alarm is sounded.

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