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.

Radiation

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