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Topic: Uranium

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  uranium. The Columbia Encyclopedia, Sixth Edition. 2001-05
Uranium is a hard, dense, malleable, ductile, silver-white, radioactive metal of the actinide series in group IIIb of the periodic table.
The uranium is obtained as pure uranyl nitrate, UO O, which is typically decomposed to the trioxide, UO, by heating and reduced to the dioxide, UO, with hydrogen.
Before the discovery of nuclear fission by Otto Hahn and Fritz Strassmann in 1939, the principal use of uranium (chiefly as the oxides) was in pigments, ceramic glazes, and a yellow-green fluorescent glass and as a source of radium for medical purposes.
www.bartleby.com /65/ur/uranium.html   (718 words)

  Uranium - Wikipedia, the free encyclopedia
Uranium salts are mordants of silk or wool.
Uranium dioxide a dark brown, crystalline powder, once used in the late 1800s to mid-1900s in ceramic glazes is now is used mainly as nuclear fuel, specifically in the form of fuel rods.
Uranium carbonate (UO)) is found in both the mineral and organic fractions of coal and its fly ash and is the main component of uranium in mine tailing seepage water.
en.wikipedia.org /wiki/Uranium   (3060 words)

 ATSDR - ToxFAQs™: Uranium
Uranium is a common naturally occurring and radioactive substance.
Uranium metal is silver-colored with a gray surface and is nearly as strong as steel.
Uranium is normally measured in a sample of urine collected and sent to a laboratory.
www.atsdr.cdc.gov /tfacts150.html   (1299 words)

 New Uranium Bull
Uranium is a chemical element extracted from ore bodies around the earth that when refined becomes a highly dense radioactive metal.
Uranium, similar to any other industrialized natural resource such as oil or coal, is a non-renewable source of energy in which its supply is solely dependent on how much can be taken from the ground.
Uranium is a mineral that will fly with this commodities bull, and those companies that mine it will be well positioned to capitalize on the rising prices chasing huge global demand.
www.zealllc.com /2005/uranium.htm   (3266 words)

 NRC: Uranium Milling
Uranium milling and disposal of the resulting byproduct material waste by NRC licensees are regulated under 10 CFR Part 40, Appendix A. Uranium ore is extracted from the earth through a variety of mining techniques.
Uranium is extracted from ore at uranium mills and at in situ leach facilities.
Uranium mill tailings, which contain most of the progeny of uranium, are a significant source of radon and radon progeny releases to the environment.
www.nrc.gov /materials/fuel-cycle-fac/ur-milling.html   (599 words)

 Uranium   (Site not responding. Last check: 2007-11-06)
Uranium can be prepared by reducing uranium halides with alkali or alkaline earth metals or by reducing uranium oxides by calcium, aluminum, or carbon at high temperatures.
Uranium metal is used for X-ray targets for production of high-energy X-rays; the nitrate has been used as a photographic toner, and the acetate is used in analytical chemistry.
uranium and its compounds are highly toxic, both from a chemical and radiological standpoint.
www.scescape.net /~woods/elements/uranium.html   (874 words)

 IEER Factsheet | Uranium
Uranium is the principal fuel for nuclear reactors and the main raw material for nuclear weapons.
The property of uranium important for nuclear weapons and nuclear power is its ability to fission, or split into two lighter fragments when bombarded with neutrons releasing energy in the process.
Uranium is generally used in reactors in the form of uranium dioxide (UO) or uranium metal; nuclear weapons use the metallic form.
www.ieer.org /fctsheet/uranium.html   (1325 words)

 Uranium Production - Nuclear Weapons
Uranium is used in inertial guidance devices, in gyro compasses, as counterweights for aircraft control surfaces, as ballast for missile reentry vehicles, and as a shielding material.
The ammonium-containing uranium salt is decomposed to UO 3 by heating, and this oxide is reduced to UO 2 with hydrogen or cracked NH 3.
Uranium tetrachloride is produced by the reaction of carbon tetrachloride (CCl 4) with pure UO 2 at 700 °F. Many countries around the world have extracted uranium from its ores or from yellowcake.
www.fas.org /nuke/intro/nuke/uranium.htm   (6776 words)

Uranium is now indelibly associated with atom bombs and nuclear power, but was a chemical curiosity of little importance for a hundred years after its discovery.
Uranium was found to have the atomic weight of 238.07, the greatest of any element, and was assigned the symbol U. A fresh surface of metallic uranium is white and lustrous, with a bluish tinge, but it soon tarnishes in air.
Uranium is, therefore, an electron donor, easily oxidized, and exhibits valences of +3, +4, +5 and +6, with +4 (uranous) and +6 (uranyl) being the most prominent.
www.du.edu /~jcalvert/phys/uranium.htm   (7783 words)

 Uranium | Radiation Protection Program | US EPA   (Site not responding. Last check: 2007-11-06)
Uranium in soil and rocks is distributed throughout the environment by wind, rain and geologic processes.
Uranium does not absorb through the skin, and alpha particles released by uranium cannot penetrate the skin, so uranium that is outside the body is much less harmful than it would be if it where inhaled or swallowed.
Since uranium tends to concentrate in specific locations in the body, risk of cancer of the bone, liver cancer, and blood diseases (such as leukemia) are increased.
www.epa.gov /radiation/radionuclides/uranium.htm   (1493 words)

 World Nuclear Association : Nuclear Information
On a scale arranged according to the increasing mass of their nuclei, uranium is the heaviest of all the naturally-occurring elements (Hydrogen is the lightest).
Uranium may also be mined by in situ leaching (ISL), where it is dissolved from a porous underground ore body in situ and pumped to the surface.
Uranium is sold only to countries which are signatories of the Nuclear Non-Proliferation Treaty, and which allow international inspection to verify that it is used only for peaceful purposes.
www.world-nuclear.org /education/uran.htm   (2250 words)

Uranium can be made by reducing uranium halides with alkali or alkaline earth metals or by reducing uranium oxides by calcium, aluminum, or carbon at high temperatures.
Uranium in the skeleton is believed to be roughly in equilibrium with intake.
Uranium sorption is likely due to its reduction from the hexavalent state, where it is introduced via surface waters, to the tetravalent state found in the confined aquifers.
www.speclab.com /elements/uranium.htm   (1813 words)

 Uranium Radiation Properties
Uranium mill tailings are the residual waste from the process of uranium extraction from the uranium ore.
Compared to uranium ore, the alpha radiation of uranium mill tailings and thus the radiation hazard on ingestion or inhalation of tailings (dust) is approx.
This is obtained from the uranium ore concentrate by refining and conversion.
www.wise-uranium.org /rup.html   (3051 words)

 It's Elemental - The Element Uranium
Uranium was discovered by Martin Heinrich Klaproth, a German chemist, in the mineral pitchblende (primarily a mix of uranium oxides) in 1789.
Uranium-238, uranium's most common isotope, can be converted into plutonium-239, a fissionable material that can also be used as a fuel in nuclear reactors.
Uranium trioxide (UO) is an orange powder and has been used in the manufacture of Fiestaware plates.
education.jlab.org /itselemental/ele092.html   (662 words)

 Iraqi cancers, birth defects blamed on U.S. depleted uranium   (Site not responding. Last check: 2007-11-06)
Depleted uranium, known as DU, is a highly dense metal that is the byproduct of the process during which fissionable uranium used to manufacture nuclear bombs and reactor fuel is separated from natural uranium.
Uranium, a weakly radioactive element, occurs naturally in soil and water everywhere on Earth, but mainly in trace quantities.
The residue of this firestorm is an extremely fine ceramic uranium dust that can be spread by the wind, inhaled and absorbed into the human body and absorbed by plants and animals, becoming part of the food chain.
seattlepi.nwsource.com /national/95178_du12.shtml   (2432 words)

 WHO | Depleted uranium
Of the uranium that is absorbed into the blood, approximately 70% will be filtered by the kidney and excreted in the urine within 24 hours; this amount increases to 90% within a few days.
Although uranium released from embedded fragments may accumulate in the central nervous system (CNS) tissue, and some animal and human studies are suggestive of effects on CNS function, it is difficult to draw firm conclusions from the few studies reported.
Insoluble uranium compounds with very low absorption rate are markedly less toxic to the kidney, and a tolerable intake via ingestion of 5 µg per kg of body weight per day is applicable.
www.who.int /mediacentre/factsheets/fs257/en   (1959 words)

 Uranium Glass from the Glass Encyclopedia
During the latter part of the 19th century, glass containing uranium was made with heat sensitive chemicals which turned milky white when reheated, producing a shading effect from yellow to milky white at the edges.
The description "uranium glass" is disliked by some glass collectors, especially in the USA, where the term "vaseline glass" is used to cover any kind of yellow or green glass which glows under ultra-violet light.
If you are looking for uranium glass, you can usually find items on offer on ebay (click here to see uranium glass listings on ebay).
www.glassencyclopedia.com /uraniumglass.html   (501 words)

 Oases in Navajo desert contained 'a witch's brew' - Los Angeles Times
Uranium levels in the water at Cameron were as high as 139 picocuries per liter in wells and up to 4,024 in abandoned pits like the ones where Lois Neztsosie watered her sheep and filled her drinking bottles.
The only time uranium came up, he said, was in regard to "family occupation." Someone wondered whether the fathers had been miners and whether uranium exposure might have affected their genes.
From 1944 to 1986, 3.9 million tons of uranium ore were dug and blasted from Navajo soil, nearly all of it for America's atomic arsenal.
www.latimes.com /news/nationworld/nation/la-na-navajo20nov20,0,4270583,full.story   (4048 words)

The element uranium is generally thought of today in connection with nuclear reactors or atomic bombs, but in the 19th century and the early part of the 20th century it played a significant role in photography.
A uranium print, which uses uranium metal instead of silver to form the image, is sometimes called a uranotype.
Of course uranium is radioactive but unless you plan on drinking the toner or taking a bath in it it there is nothing to worry about since the amount of uranium in the toner is very small.
unblinkingeye.com /Articles/Uranium/uranium.html   (796 words)

 92 Uranium
Uranium is the icon of the nuclear age, It's the basis of nuclear power reactors and nuclear bombs (including those made with plutonium, which must be made from uranium in nuclear reactors).
The radiation from uranium is largely of a type that does not penetrate skin much past the outer layer of dead cells, and hence is not particularly harmful if it's outside of you.
On the other hand, the number of people killed by uranium poisoning is probably significantly smaller than the number killed by whatever difficulty was causing their country to get shot up in the first place.
www.theodoregray.com /PeriodicTable/Elements/092/index.s7.html   (4822 words)

 What is Uranium?   (Site not responding. Last check: 2007-11-06)
Uranium is a very heavy (dense) metal which can be used as an abundant source of concentrated energy.
The high density of uranium means that it also finds uses in the keels of yachts and as counterweights for aircraft control surfaces (rudders and elevators), as well as for radiation shielding.
Uranium may also be mined by in situ leaching (ISL), where it is dissolved from a porous underground orebody in situ and pumped to the surface.
www.uic.com.au /uran.htm   (2399 words)

The spot uranium market remains quiet with market participants focused on the upcoming results of two closed bid auctions to be conducted next week.
Denver, Colorado, May 1, 2007—With TradeTech’s uranium spot price holding at US$113 per pound uranium oxide (U3O8), market participants are waiting to see if the launch of uranium futures contracts will bring more price volatility to a market that has already witnessed record price increases over the past two years.
In fact, transparency is generally very limited within the uranium market since it has traditionally been traded only between end users, such as electric utility fuel managers and uranium producers, according to Clark.
www.uranium.info   (918 words)

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