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| the emission of visible light when exposed to radiant energy (usually ultraviolet radiation) |
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| a beam of electrons emitted from a cathode when electricity is passed through an evacuation tube |
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| electromagnetic radiation in the visible and lower-energy regions of the electromagnetic spectrum with insufficient energy to form ions when it transfers energy to matter |
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| nuclear radiation and high-energy electromagnetic radiation with sufficient energy to produce ions by ejecting electrons from atoms and molecules |
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| a change in an atom's nucleus due to the spontaneous emission of alpha, beta, or gamma radiation |
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| a form of ionizing radiation that results from changes in the nuclei of atoms |
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| high-speed, positively charged particles emitted during the decay of some radioactive elements; consisting of a helium nucleus. |
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| negatively charged particles emitted during the decay of some radioactive elements; composed of high-speed electrons |
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| high-energy electromagnetic radiation emitted during the decay of some radioactive elements |
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| particles smaller than an atom; commonly regarded as electrons, protons, and neutrons |
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