glow rocks go brr brr.-- In nature, uranium is found as ura…

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glow rocks go brr brr.--
In nature, uranium is found as uranium-238 (99.2739–99.2752%), uranium-235 (0.7198–0.7202%), and a very small amount of uranium-234 (0.0050–0.0059%).[4] Uranium decays slowly by emitting an alpha particle. --/wiki/Uranium