Alpha - distance travelled - a few cm, Beta - distance travelled - About a metre, Beta - stopped by - Thin sheet of metal, Gamma - penetration - Most penetrating, Alpha - ionisation - Most ionising, Beta - ionisation - Moderately ionising, Alpha - deflection in an electric field - Deflected towards negative plate, Beta - deflection in an electric field - Deflected towards positive plate, Alpha - structure - 2 protons and 2 neutrons, Beta - structure - a high-speed electron,

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