Uranium is a chemical element with symbol U and atomic number 92. It is a silvery-white metal in the actinide series of the periodic table. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. It occurs naturally in low concentrations of a few parts per million in soil, rock and water, and is commercially extracted from uranium-bearing minerals such as uraninite.
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RS-44 Geology and Mineral Resources of Saguache County, Colorado
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RockTalk: Uranium — It’s Hot!!
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IS-24 Radon: Issues and Answers
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RS-26 Colorado Energy Balance, 1981
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OF-82-02 Potential Sites Suitable for Relocation and/or Reprocessing of the Grand Junction and Rifle Uranium Mill Tailings...
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OF-81-01 Preliminary Report on Potential Sites Suitable for Relocation and/or Reprocessing the Durango Uranium Mill Tailings...
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OF-81-07 Colorado Energy Activity Profile
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