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Medical tracers and also for treating cancers. Some can be used for industrial x-rays. (They used to have very many uses that are now illegal - like luminous paints.) Smoke alarms use a tiny pellet of an alpha source - Americium. This isotope ionises the air within the detector to create a tiny standing current. Smoke disrupts this current and triggers the alarm. This use is controversial and its use is being phased-out in some parts of the world.

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