Alpha radiation: Made of 2 protons and 2 neutrons (same as a helium nucleus), Not very penetrating , Highly ionising, Only travels a few cm in air, Stopped by a thin sheet of paper, Beta radiation: Made up of a fast-moving electron, Neutron --> Proton + high energy electron, Fairly penetrating, Fairly ionising, Travels several metres in air, Stopped by a thin sheet of aluminium, Gamma radiation: Made of electromagnetic waves, Highly penetrating, Not very ionising, Travels several km in air, Stopped by thick blocks of concrete or lead,

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