Radioactivity - The ionizing radiation given out by the decay of atomic nuclei, Isotope - a chemical element with the same number of protons but a different number of neutrons, Half-life - The time taken for half of the atoms in a radioactive substance to decay, Decay - when an unstable atomic nucleus loses energy by emitting radiation and breaking up, Nuclear radiation - Energy in the form of ionizing particles or electromagnetic wave that come from the nucleus of an atom, Background radiation - The ionizing radiation that is found in the environment from natural and human-made sources, Geiger-Muller tube - A device that is used to detect and measure ionizing radiation, Alpha particle - A type of ionizing radiation made up of two protons and two neutrons, equivalent to the nucleus of a helium atom, Beta particle - A type of ionizing radiation made up of high-energy electrons or positrons emitted from a nucleus, Gamma ray - A type of high-energy ionizing radiation emitted from a nucleus as a result of radioactive decay,

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