Radioactive americium 241 from a smoke detector is a potent alpha radiation emitter with an energy of 5.38 MeV. Alpha particles are helium nucleii (2 protons and 2 neutrons).
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Tritium tubes have radioactive tritium gas and a phosphor which glows constantly. Tritium is hydrogen with two neutrons. It is radioactive with a half life of 12.3 years.
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