absorption   - process in which matter takes in energy, e.g. when an atom takes in energy from an electromagnetic wave, activity - the rate at which unstable nuclei decay in a sample of a radioactive material; unit becquerel, Bq, alpha particle - a particle (two neutrons and two protons, same as a helium nucleus) emitted by an atomic nucleus during radioactive decay, atomic number - number of protons in the nucleus of an atom of an element, background radiation - nuclear radiation that is present in the environment as a result of the radioactive decay of certain elements; it is produced from natural sources (e.g., from radon gas in the Earth’s crust) and from artificial sources (e.g., as a result of testing nuclear weapons), becquerel - unit of activity for a radioactive isotope, symbol Bq, beta particle - fast-moving electron that is emitted by an atomic nucleus in some types of radioactive decay, cancer - disease in which uncontrolled division of cells takes place, forming a tumour; some types of cancer are caused by the effects of ionising radiation on cells, cell (living things)  - smallest structural unit of a living organism; cells may be damaged by some types of ionising radiation, chain reaction - occurs when the neutrons released by a nucleus undergoing fission go on to split more nuclei, contamination (radioactivity)  - the unwanted presence of materials containing radioactive atoms, count rate  - the number of decays recorded each second by a detector (e.g. Geiger–Muller tube),

kS4 Radioactivity Glossary match up

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