A radioactive isotope of uranium that decays through a series of radioactive transformations.
From Greek 'aktis' (ray) + 'uranium' (the element). This term was used in early nuclear physics to describe uranium's radioactive nature and decay series.
Actinouranium is an old-fashioned term for uranium-235, which is famous for being the fuel that powered the atomic bombs dropped on Japan and now fuels nuclear reactors—it literally means 'ray-uranium' because it constantly emits radiation!
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