A radioactive source is a material that emits radiation as a result of the decay of unstable atomic nuclei. This decay process can include the emission of alpha particles, beta particles, gamma rays, or neutrons. Radioactive sources can be found in various forms, such as gases, liquids, and solids, and can be naturally occurring (like uranium or radon) or artificially produced (such as cesium-137 or cobalt-60).
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