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Grand Junction
Grand Junction city (1990 pop. 29,034), seat of Mesa co., W Colo., at the junction of the Gunnison and Colorado rivers; inc. 1891. The shipping and processing center of a large ranch and irrigated farm region, it also serves the area's uranium, oil shale, gas, and coal-mining industries. Electronic...
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uranium
uranium , radioactive metallic chemical element; symbol U; at. no. 92; at. wt. 238.0289; m.p. 1,132°C; b.p. 3,818°C; sp. gr. 19.1 at 25°C; valence +3, +4, +5, or +6.
Properties
Uranium is a hard, dense, malleable, ductile, silver-white, radioactive metal of the actinide series...
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pitchblende
pitchblende , dark, lustrous, heavy mineral, a source of radium and uranium. Largely natural uranium oxides, triuranium octaoxide (U 3 O 8 ) and uranium dioxide (UO 2 ), it usually contains some lead and variable amounts of thorium and rare-earth elements. It is massive in form, frequently with a bo...
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actinium series
actinium series natural radioactive decay series beginning with uranium -235 (also called actinouranium) and ending with lead -207. See radioactivity .
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Port Hope
Port Hope town (1991 pop. 11,505), SE Ont., Canada, on Lake Ontario, E of Toronto. It has a large plant for refining uranium ore and is a summer resort.
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Rapid City
Rapid City city (1990 pop. 54,523), seat of Pennington co., SW S.Dak., on Rapid Creek, in an irrigated farm region served by the Bureau of Reclamation's Rapid Valley project; founded 1876 after the discovery of gold nearby, inc. 1882. It is the trade and transportation center of an extensive lumber...
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Spokane
Spokane , city (1990 pop. 177,196), seat of Spokane co., E Wash., at the spectacular falls of the Spokane River; inc. 1881. It is a port of entry and the commercial, transportation, and industrial center of a productive region known as the "Inland Empire," comprising E Washington, N Idaho, W Mon...
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Manhattan Project
Manhattan Project the wartime effort to design and build the first nuclear weapons ( atomic bombs ). With the discovery of fission in 1939, it became clear to scientists that certain radioactive materials could be used to make a bomb of unprecented power. U.S. President Franklin Delano Roosevelt re...
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Martin Heinrich Klaproth
Martin Heinrich Klaproth , 1743-1817, German chemist. He is often referred to as the father of analytic chemistry. He recognized (1789) the presence of zirconium in the ore zirconia and of uranium in a precipitate of pitchblende. He also worked on other elements, including titanium and tellurium.
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Krugersdorp
Krugersdorp , city (1991 pop. 196,213), Gauteng, NE South Africa. The chief industrial city of the W Witwatersrand , Krugersdorp is the center for a region where gold, manganese, asbestos, lime, and uranium are mined. The city has uranium extraction plants. It also serves as the trade center for th...
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