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Tritium is a heavy radioactive isotope of hydrogen which decays via beta radiation with a half-life of 12 years. When enclosed in a container lined with a suitable phosphor, it produces a weak but sustained light that can last for up to 20 years, which is used in various applications including emergency exit signs and gunsights. Tritium is also more easily fused than regular hydrogen, and has seen widespread application in both civilian fusion projects and nuclear weapons design.