The decay of radioactive substances 3.0 / 5 based on 1 rating ? PhysicsRadioactivityGCSEAQA Created by: Pea_emmaCreated on: 05-04-13 15:18 The smallest part of an element; the building blocks of matter Atom 1 of 9 Nuclei that are radioactive and emit radiation Unstable nuclei 2 of 9 The decay of unstable nuclei by the emission of alpha or beta particles gamma radiation Radioactive 3 of 9 Radiation that is around us; predominantly from natural sources Background radiation 4 of 9 High energy, high frequency electromagnetic radiation Gamma Radiation 5 of 9 A helium nucleus; 2 protons and 2 neutrons Alpha particle 6 of 9 An electron emitted from the nucleus Beta particle 7 of 9 The ability of particles or electromagnetic radiation to ionise other neutral atoms or molecules Ionising power 8 of 9 The average time taken for half of the unstable atoms in a radioactive material to decay Half-life 9 of 9
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