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Created page with "== Introduction == Radioactive decay is a fundamental concept in nuclear physics and chemistry, describing the process by which an unstable atomic nucleus loses energy by radiation. This decay, or loss of energy, results in an atom of one type, called the parent nuclide, transforming into an atom of a different type, named the daughter nuclide. Image:Detail-69097.jpg|thumb|center|A close-up view of a radioactive substance decaying.|c..."