Radioactivty definitions 4.4 0.0 / 5 ? PhysicsRadiationGCSEAll boards Created by: OliviaCreated on: 13-04-18 15:25 Radiation The emission of energy as electromagnetic waves or subatomic particles which cause ionisation 1 of 6 Half life The time it takes for the substance to decay by half / the time taken for the number of decays to fall by half 2 of 6 Short half life The activity falls quickly as the nuclei are very unstable and rapidly decay 3 of 6 Long half life The activity falls slower because most of the nuclei dont decay for a long time 4 of 6 Nuclear fission A type of nuclear reaction that is used to release energy from large and unstable atoms by splitting them into smaller atoms 5 of 6 Nuclear fusion The process in which two small nuclei combine to form a larger one, releasing energy 6 of 6
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