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MSN Encarta - Uranium Uranium is soluble in hydrochloric and nitric acids, and it is insoluble in alkalies. Uranium never occurs naturally in the free state but is found as an oxide or complex salt in minerals such as pitchblende and carnotite. The radioactive properties of uranium were first demonstrated in 1896 when the French physicist Antoine Henri Becquerel produced, by the action of the fluorescent salt potassium uranyl sulfate, an image on a photographic plate covered with a light-absorbing substance. encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761557628   (593 words)

Uranium 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 were inhaled or swallowed. The decay of uranium and its nuclear reactions with thorium in the Earth's core is thought to be the source for much of the heat that keeps the outer core liquid, which in turn drives plate tectonics. A heavy, silvery-white, toxic, metallic, and naturally-radioactive element, uranium belongs to the actinide series and its isotope uranium-235 is used as the fuel for nuclear reactors and nuclear weapons. www.sciencedaily.com /encyclopedia/uranium   (2150 words)

Uranium-235 - Wikipedia, the free encyclopedia Uranium-235 is an isotope of uranium that differs from the element's other common isotope, uranium-238, by its ability to cause a rapidly expanding fission chain reaction. This concentration is insufficient for a self sustaining reaction in a mass of pure uranium or a light water reactor; enrichment, which just means separating out the uranium-238, must take place to get a usable concentration of uranium-235. A uranium nucleus that absorbs a neutron splits into two lighter nuclei; this is called nuclear fission. en.wikipedia.org /wiki/Uranium-235   (239 words)

Medical Consequences of Depleted Uranium DU is actually uranium 238, what's left after the fissionable element uranium 235 is extracted from the ore and used as fuel for weapons and nuclear reactors. Because radioactive uranium 238 and its decay products are both alpha and beta emitters, as a carcinogen it can damage cells in the lung, bone, kidney, prostate, gut and brain causing cancer in those organs, as found in a 1999 review of US uranium workers conducted by the Department of Energy. Uranium 238 has a half-life of 4.5 billion years, while neptunium 237 and plutonium 239 which are many times more carcinogenic than uranium, have half lives of some hundreds of thousands of years. www.stopnato.org.uk /du-watch/caldicott/medico.htm   (525 words)

Uranium Enrichment Uranium enrichment is an isotopic separation process that increases the proportion of the uranium-235 isotope in relation to uranium-238 in natural uranium. Using uranium as a fuel in the types of nuclear reactors common in the United States requires that the uranium be enriched so that the percentage of the uranium-235 isotope is increased, typically to 3 to 5%. The uranium hexafluoride (UF6) is heated and converted from a solid to a gas. web.ead.anl.gov /uranium/guide/depletedu/enrich/index.cfm   (460 words)

World Nuclear Association Information and Issue Briefs Uranium and Depleted Uranium Uranium may also be mined by in situ leaching (ISL), where it is dissolved from the orebody in situ and pumped to the surface. Uranium was discovered by Martin Klaproth, a German chemist, in 1789 in the mineral pitchblende, and was named after the planet Uranus. 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 /info/inf14.htm   (3364 words)

Uranium-238 - Wikipedia, the free encyclopedia Depleted uranium consists mainly of the 238 isotope, and enriched uranium has a higher-than-natural quantity of the uranium-235 isotope. Uranium-238, otherwise known as Brannerite, is the most common isotope of uranium found. However, in a nuclear reactor, uranium-238 can be used to breed plutonium, which itself can be used in a nuclear weapon or as a reactor fuel source. en.wikipedia.org /wiki/Uranium-238   (257 words)

IEER Factsheet Uranium Uranium is generally used in reactors in the form of uranium dioxide (UO) or uranium metal; nuclear weapons use the metallic form. 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. www.ieer.org /fctsheet/uranium.html   (1325 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   (2821 words)

FAQ 5-Is uranium radioactive? A sample of natural uranium (as mined) is composed of 99.3% uranium-238, 0.7% uranium-235, and a negligible amount of uranium-234 (by weight), as well as a number of radioactive decay products. Uranium atoms decay into other atoms, or radionuclides, that are also radioactive and commonly called "decay products." Uranium and its decay products primarily emit alpha radiation, however, lower levels of both beta and gamma radiation are also emitted. However, because several of the radioactive uranium decay products are gamma emitters, workers in the vicinity of large quantities of uranium in storage or in a processing facility can also be exposed to low levels of external radiation. web.ead.anl.gov /uranium/faq/uproperties/faq5.cfm   (277 words)

Churchill County (Fallon) Nevada Cancer Study - FAQs - Uranium Uranium is a common, naturally occurring element, present in low amounts in rocks, soil, air, surface water and groundwater. In order for uranium outside the body to cause such injury, the levels of uranium in the environment have to be very high as to be easily detected by instrumentation or lab analysis. Again, in order for uranium inside the body to cause cancer, the levels of uranium have to be so large that they are easily detected by laboratory analysis and almost certainly will cause severe kidney damage before any sign of cancer is detected. www.cdc.gov /nceh/clusters/Fallon/faq-uranium.htm   (783 words)

Nuclear Facilities Management Uranium is a naturally occurring element containing uranium-235 and uranium-238 isotopes. Enrichment is the process of increasing the concentration of uranium-235 while decreasing the concentration of uranium-238. Uranium is referred to as a ‘special radioactive element' because it is capable of undergoing fission. www.ne.doe.gov /uranium/facts.html   (680 words)

Re: Nuclear Energy These different varieties or 'isotopes' of uranium have exactly the same chemical properties, but differ very slightly in a few properties that depend on the weight of atoms, because U-235 atoms are a little bit lighter than U-238. Uranium is prepared in the form of uranium hexafluoride, a very heavy gas. Uranium was put in a furnace in a vacuum. www.madsci.org /posts/archives/may96/831320678.Bc.r.html   (693 words)

What are the Radioactive Byproducts of Depleted Uranium (Uranium-238)? Uranium-238 is also referred to as ''depleted uranium''. When uranium ore is extracted from the earth, most of the uranium is removed from the crushed rock during the milling process, but the radioactive decay products are left in the tailings. Depleted uranium remains radioactive for literally billions of years, and over these long periods of time it will continue to produce all of its radioactive decay products; thus depleted uranium actually becomes more radioactive as the centuries and millennia go by because these decay products accumulate. www.ccnr.org /decay_U238.html   (403 words)

uranium-234-uranium-238 dating --  Encyclopædia Britannica In general, uranium used as fuel is in the form of small cylinders that are encased in a metal tube called cladding. Uranium dioxide is the chemical form most commonly used in large, modern reactors. Uranium is the last naturally occurring element in the periodic table. www.britannica.com /eb/article-9074426?tocId=9074426   (743 words)

La France nucleaire/Nuclear France: PLUTONIUM (ENGLISH) Plutonium is more harmful than uranium 235 and uranium 238, in great part because of the differences in their half-lives and, consequently, in their specific activity. The alpha particles emitted in the disintegration of plutonium 239 are about 25% more energetic than those emitted by the disintegration of uranium 238 and of uranium 235. As with the compounds of uranium, the impact on the body of plutonium compounds depends on the solubility of the compound. www.francenuc.org /en_mat/plutonium_e.htm   (1566 words)

DEPLETED URANIUM: USES AND HAZARDS Although, DU is 60 % less radioactive than natural uranium because U-234 and U-235 which emit gamma rays and beta particles have been removed Depleted uranium or uranium 238 is still very dangerous as an internal hazard because the alpha particle emissions are not reduced but proportionally increased. Depleted uranium or U-238 has an atomic mass of 238. Uranium hexaflouride is the non-fissionable residue or by-product of the uranium enrichment process during which fissionable Uranium 235 and Uranium 234 are separated from natural uranium. www.stopnato.org.uk /du-watch/rokke/rokke.htm   (3974 words)

Lowry unrealistic about depleted uranium He is in the ballpark when he says 300 tons of depleted uranium was used in the first Gulf War, but he is confusing the issue, and perhaps himself, when he says DU is depleted. There is a lot of uranium in the ocean, but you would have to drink about 25 tons of seawater before you would need to worry. Possibly 100 tons of the 300 tons of DU used in Iraq were converted on impact into gaseous uranium oxide or a finely divided uranium powder. seattlepi.nwsource.com /opinion/107382_uranium06.shtml   (637 words)

Nuclear Chemistry Uranium hexafluoride (UF), the gaseous compound of uranium, is used in this process. Uranium ions for the EMIS are generated from solid uranium tetrafluoride, UF, that is heated to produce a vapor that is then bombarded with electrons to produce U Uranium for nuclear weapons is enriched to greater than 90%. chemcases.com /nuclear/nc-07.htm   (946 words)

NRC: Uranium Enrichment The uranium enriched in uranium-235 is required in commercial light water reactors to produce a controlled nuclear reaction. These are the different isotopes of uranium, which means that while they all contain 92 protons in the atom’s center (which is what makes it uranium). Process: In the gaseous diffusion enrichment plant, the solid uranium hexafluoride (UF6) from the conversion process is heated in its container until it becomes a liquid. www.nrc.gov /materials/fuel-cycle-fac/ur-enrichment.html   (741 words)

It's Elemental - The Element Uranium 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. Naturally occurring uranium consists of three isotopes: uranium-234, uranium-235 and uranium-238. To produce plutonium-239, atoms of uranium-238 are exposed to neutrons. education.jlab.org /itselemental/ele092.html   (662 words)

Depleted Uranium Natural uranium is made up mostly of Uranium 238 (99.2745% by atom percent) and Uranium 235 (0.72% atom percent). The uranium compound is reduced to UO powder, which is pelletized, sintered, and encapsulated in tubes for reactor usage. Uranium has some special chemical and biological characteristics: since natural uranium has a low specific activity, chemical damage to the kidneys is likely to be more limiting than radiation damage. www.physics.isu.edu /radinf/du.htm   (845 words)

Uranium 238 So usually to use the uranium in a power plant, the amount of U235 must be increased, run the ore thru a plant and pull out slightly more U238 than U235, leaving an enriched uranium, enough U235 to run the reactor. Ross ======================================================== Natural Uranium contains a mixture of U235 and U238 isotopes. Since Uranium is a very heavy element, heavier than lead, it is also used in artillery shells. www.newton.dep.anl.gov /askasci/phy00/phy00108.htm   (414 words)

Dating Exhibit The half-life of uranium--238 is 4,470,000,000 years, that is, in that many years half of the original amount is still uranium- the other half has lost protons to form a different element which is more stable. Uranium-Thorium dating is an absolute dating technique which uses the properties of the radio-active half-life of Uranium-238 and Thorium-230. When the amounts of uranium and thorium are compared an accurate estimation of the age of an object can be obtained. www.mnsu.edu /emuseum/archaeology/dating/uranium_dating.html   (293 words)

Howstuffworks "How Nuclear Power Works" U-235 makes up about 0.7 percent of the remaining uranium found naturally, while U-234 is even more rare and is formed by the decay of U-238. U-238 makes up 99 percent of the uranium on the planet. Uranium is a fairly common element on Earth, incorporated into the planet during the planet's formation. science.howstuffworks.com /nuclear-power1.htm   (196 words)

Chemistry : Periodic Table : uranium : key information Uranium is of great interest because of its application to nuclear power and nuclear weapons. Uranium gives interesting yellow and green colours and fluorescence effects when included to glass in conjunction with other additives. The image is reproduced with the permission of Ken Tomabechi at the Uranium Glass Gallery in Japan, where you can find further information about uranium glass. www.webelements.com /webelements/elements/text/U/key.html   (215 words)

Depleted Uranium - SourceWatch As Alliant has removed all references to uranium or depleted uranium in its public notices, web pages and press releases, we can at this point only infer that the newest contracts are for uranium weapons or penetrates that contain uranium 238- until an investigative reporter picks up the story... The remaining uranium, which is 99.8% uranium 238 is misleadingly called 'depleted uranium'. During this process, the fissionable isotope Uranium 235 is separated from uranium. www.sourcewatch.org /wiki.phtml?title=Depleted_Uranium   (2015 words)

Activist : The Use of the Radioactive Material Depleted Uranium U-238 (DU) as a Military Weapon Uranium occurs in soils at an average concentration of 3 parts per million, equivalent to a teaspoon of uranium in a truckload of dirt.4 Other than a lower U-235 content, the nuclear, chemical and metallurgical properties of depleted and natural uranium are essentially identical.5 It is estimated that there is one million tons of DU in the world.3 Despite the name "Depleted" Uranium, DU has 60% the radioactivity of natural uranium, which is pure uranium. DU is the waste product left after natural uranium has gone through the gaseous diffusion process removing most of the fissionable isotope U-235. users.westnet.gr /~cgian/du-weapon.htm   (1630 words)

Nukewatch The unnamed U.S. official said of Al Qaeda's uranium-238 (U-238), "In addition to killing people in the bomb blast and poisoning others with radiation such a bomb could render large areas unusable and require lengthy and expensive clean-up efforts." This description is the same one used by the movement to ban U-238 weapons. When the U.S. Air Force uses U-238, it is called "depleted uranium." But depleted uranium munitions are made of U-238. The Telegraph (London) reported Sept. 23, that depleted uranium shells were being transported to the Middle East for use in the war against terrorism despite concerns of health threats to thousands of NATO service personnel. www.nukewatch.com /pathfinder/w0102/w102du.html   (754 words)

Depleted Uranium Natural uranium consists primarily of a mixture of two isotopes (forms) of uranium, Uranium-235 (U235) and Uranium-238 (U238), in the proportion of about 0.7 and 99.3 percent, respectively. Natural uranium is a slightly radioactive metal that is present in most rocks and soils as well as in many rivers and sea water. Depleted uranium results from the enriching of natural uranium for use in nuclear reactors. www.fas.org /man/dod-101/sys/land/du.htm   (475 words)

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