Gamma - An electromagnetic wave, Alpha - 2 protons 2 neutrons, Beta - Fast moving electron, Unstable - Will change structure , Half Life - Time taken for the number of radioactive nuclei to decrease to half the initial value, Lead - Stops gamma radiation (as well as alpha and beta), Aluminium - Stops beta radiation (as well as alpha), Paper - Stops alpha, Ionizing Radiation - Means radiation that can strip electrons from atoms, Become cancerous - Cells that are ionized can, -2 - How does the proton number change during alpha emission, -4 - How does the mass number change during alpha emission, +1 - How does the proton number change during beta emission, No change - How does the mass number change during beta emission, Bequerels - Units of activity, Geiger Counter - Used to detect radiation,

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