A polonium 210 source in a needle is used for Alpha particle experiments such as cloud chambers. The activity is less than 0.1 uCurie and the half life is 138 days. I had better get on and do stuff before it goes away.
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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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A Geiger counter measures various types of ionising radiation such as Gamma rays. Shown here with antique Uranium marbles that were bright due to some fluorescence.
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