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This Review contains major "Uranium"- related terms, short phrases and links grouped together in the form of Encyclopedia article.
- Uranium is a radioactive, metallic element with 92 protons and a variable number of neutrons in the nucleus of each atom.
- Uranium is the first element in a long series of decay that produces radium and radon.
- Uranium is a silvery-white metallic chemical element in the actinide series of the periodic table with atomic number 92.
- Uranium is a hard, dense, malleable, ductile, silver-white, radioactive metal of the actinide series in Group 3 of the periodic table.
- Uranium is a heavy metal and has many more neutrons than protons.
- There, he investigated the products of the bombardment of uranium by the cyclotron, then the most powerful "atom-smasher" in the world.
- The first transuranic element to be discovered was neptunium, which was formed by bombarding uranium with neutrons in a cyclotron in 1939.
- It is produced by deuteron bombardment of uranium-238 in a cyclotron, and also exists in trace quantities in naturally occurring uranium ores.
- World production of scandium is in the order of 2,000kg per year, generally as a byproduct of uranium and nickel-cobalt-copper or PGE mining.
- Most scandium is presently being recovered from thortveitite or is extracted as a by-product from uranium mill tailings.
- Euxenite is a complex titanium-niobium tantalic that contains small amounts of thorium and uranium.
- Euxenite is used as a minor ore of rare earth elements and Uranium.
- Scandium was originally found in euxenite and gadolinite, but is more commonly collected from the rare mineral thortveitite and Uranium mill tailings.
- In a fission power plant, heavy nuclei like uranium are split in smaller fragments.
- For example, hydrogen has one proton; helium, two protons; oxygen eight protons, uranium, 92 protons.
- As a result, no nuclei with protons and neutron counts greater than Uranium exist in nature.
- The resulting atom contains two less protons and two less neutrons than uranium, and has an atomic mass of 234.
- May 10, 1934 - Enrico Fermi's research group publishes a report on experiments with neutron bombardment of uranium.
- Their work was done by fission of uranium and by neutron bombardment of neodymium.
- The region no longer supports the mining of such ores as uranium, lead, tin, zinc, and copper, but coal and lignite mines are exploited.
- Yazd province is rich in minerals such as iron, lead, zinc, copper and uranium.
- Some well-known metals are aluminum, copper, platinum, gold, iron, lead, silver, titanium, tungsten, uranium and zinc.
- Sulfate minerals are also found, as is some form of salt, trace amounts of metals, notably iron, uranium, cadmium, and (rarely) gold.
- Outside the laboratory, francium is extremely rare, with trace amounts found in uranium and thorium ores.
- Neptunium occurs in nature in trace amounts in uranium ores but is produced artificially.
- D. Polystyrene foam becomes plasma, compressing secondary, and fissile uranium (U-235) sparkplug begins to fission.
- For example, one isotope of uranium, 235 U, is fissile, while another isotope, 238 U, is not.
- It can be made from natural uranium and is fissile.
- The majority of uranium is uranium-238, the presence of which would actually inhibit a fission chain reaction.
- Producing a fission chain reaction in uranium fuel is far from trivial.
- Plutonium belongs to the class of elements called transuranic elements whose atomic number is higher than 92, the atomic number of uranium.
- They assumed that these substances were new transuranic elements or isotopes of uranium.
- Transactinide elements are also transuranic elements, that is, have an atomic number greater than that of uranium (92), an actinide.
- Used nuclear fuel is a complex mixture of the fission products, uranium, plutonium and the transplutonium metals.
- The Nuclear Fuel Cycle begins when uranium is mined, enriched, and manufactured into nuclear fuel, (1) which is delivered to a nuclear power plant.
- Reprocessing can recover up to 95% of the remaining uranium and plutonium in spent nuclear fuel, putting it into new mixed oxide fuel.
- Hydrogen has one proton, helium has two, and uranium has 92, the most in any atom known to occur naturally.
- The number of such electrons equals the atomic number of the atom: hydrogen has a single orbital electron, helium has 2, and uranium has 92.
- Nuclear power can come from the fission of uranium, plutonium or thorium or the fusion of hydrogen into helium.
- In December 1938, Germans Otto Hahn and Fritz Strassman published experimental results about the bombardment of uranium with neutrons.
- Such decay produces nuclei of higher atomic number, so Fermi assumed that the bombardment of uranium led to a new element with atomic number 93.
- Hahn continued to work with Strassmann on elucidating the outcome of bombardment of uranium with thermal neutrons.
- Natural uranium is sufficiently radioactive to expose a photographic plate in an hour or so.
- Becquerel discovered that uranium salts were able to blacken a photographic plate placed in the dark, even through a paper barrier.
- One cloudy day when he couldn't perform one of his experiments, he placed the photographic plate with the uranium salt in a drawer.
- Low levels of uranium, thorium, and their decay products are found everywhere.
- Francium occurs naturally as a decay product in uranium and thorium ores.
- It occurs naturally in uranium ores and is a decay product of actinium.
- The isotope thorium-230, a decay product of uranium-238, is found in uranium deposits as well as in uranium mill tailings.
- Neptunium, the first transuranium element transuranium elements, in chemistry, radioactive elements with atomic numbers greater than that of uranium (at.
- Marie Curie (working in Paris) and her husband Pierre Curie isolated two new radioactive elements from uranium ore.
- Fission occurs when Uranium is bombarded with slow neutrons, the uranium 235 isotope becomes the short lived uranium 236.
- His group systematically bombarded elements with slow neutrons, and during their experiments with uranium, narrowly missed observing nuclear fission.
- In particular, these workers observed (1934) that at least four different radioactive species resulted from the bombardment of uranium with slow neutrons.
- In December 1938 he discovered as close collaborator of Otto Hahn the neutron-induced fission of uranium.
- Otto Hahn continued the work with Fritz Strassmann on elucidating the outcome of the bombardment of uranium with thermal neutrons.
- After bombarding uranium with slow neutrons, Otto Hahn, Lise Meitner, and Fritz Strassmann made a careful chemical analysis of the products formed.
- Using Bohr’s model of the nucleus as a water drop, Meitner and Frisch formulated a new theory of how neutrons affect Uranium .
- Hahn asked Meitner to consider the possibility the product was a Barium isotope heavier than Uranium.
- Meitner and Hahn resumed their collaboration in 1934, after Enrico Fermi published his seminal article on "transuranic" uranium.
- Once the process of gaseous diffusion is finished, the Uranium must be refined once again.
- The goal of the Manhattan Project activities in Oak Ridge was to separate and produce uranium and plutonium for use in developing a nuclear weapon.
- S-50 was a Manhattan Project production facility in Oak Ridge, Tennessee that was used to enrich uranium by means of liquid thermal diffusion.
- Their method using gaseous diffusion was scaled up in a large separation plant at Oak Ridge, using uranium hexafluoride (U F 6) gas as the process fluid.
- Associated Minerals include torbernite, autunite, uraninite and other uranium bearing minerals.
- Autunite is a secondary mineral found in the zone of oxidation and weathering of uranite or other uranium minerals.
- Uranium occurs as a major constituent of minerals such as uraninite, coffinite and autunite.
- Atomic bombs usually have plutonium 239 or uranium 235 as their fissionable material.
- It had been thought that an atomic bomb would need tons of uranium and so would be difficult to transport.
- Chadwick in this way prepared the way towards the fission of uranium 235 and towards the creation of the atomic bomb.
- Chadwick's discovery pointed the way towards the fission of uranium 235 and the creation of the atomic bomb.
- February, 1941 - Philip Abelson begins working on uranium enrichment at the Naval Research Laboratory.
- Tomsk is located about twenty kilometres south-east of the town of Seversk, a major centre of plutonium production and reprocessing and uranium enrichment.
- It is located about twenty kilometres south-east of the town of Seversk, a major centre of plutonium and uranium enrichment in Russia.
- Ahmadinejad has in the past claimed Iran succeeded in installing the 3,000 centrifuges at its uranium enrichment facility at Natanz.
- On April 9, 2007, Iran announced that it has begun enriching uranium with 3 000 centrifuges, presumably at Natanz enrichment site.
- Enrichment Cascades of gas centrifuges are used to enrich uranium ore to concentrate its fissionable isotopes.
- Also, often the elements beyond mercury, e.g., the actinides such as uranium and plutonium, are not excluded from the heavy metals.
- In the UREX process, ~99.9% of the Uranium and 95% of Technetium are separated from each other and the other fission products and actinides.
- The primary decay products before 231-Pa are element Ac (actinium) isotopes and the primary products after are element U (uranium) isotopes.
- It is found naturally in uranium ores and actinium is 150 times more radioactive than radium.
- Actinium is found in trace amounts in uranium ore, but more commonly is made in milligram amounts by the neutron irradiation of 226 Ra in a nuclear reactor.
- The spontaneous fission of uranium-238 Uranium-238 is the most common isotope of uranium found.
- However, spontaneous fission of uranium can be used in the dating of very old rock samples.
- On earth, technetium occurs naturally only in uranium ores as a product of spontaneous fission; the quantities are minute but have been measured.
- For example, after undergoing alpha decay, an atom of uranium (with 92 protons) becomes an atom of thorium (with 90 protons).
- These include alpha decay and beta decay, and heavy nuclei such as uranium may also undergo fission.
- Alpha decay usually occurs in heavy nuclei such as uranium or plutonium, and therefore is a major part of the radioactive fallout from a nuclear explosion.
- Uranium oxide concentrate (U3O8): The mixture of uranium oxides produced after milling uranium ore from a mine.
- The mixture of uranium oxides produced after milling uranium ore from a mine.
- Thorium is also found in the minerals thorite (thorium silicate) and thorianite (mixed thorium and uranium oxides).
- Energy expended to extract and to cast 6 tons of uranium and uranium oxide from their natural sources were not tabulated.
- In 1940 the first transuranium element was produced when McMillan & Abelson at Berkeley exposed uranium oxide to neutrons from a cyclotron.
- Euxenite is a rare earth titanium-tantalate containing 10 to 13 percent uranium oxide.
- Terrestrial radiation: radiation emitted by naturally occurring radioactive materials, such as uranium (U), thorium (Th), and radon (Rn) in the earth.
- Radon is a common problem during mining of uranium as it is a radioactive gas.
- Recently, the natural presence of uranium in many soils has become of concern to homeowners because of the generation of radon and its daughters.
- The weak force (mediated by W and Z particles) determines the radioactive decay of such radioactive materials as uranium, plutonium, and tritium.
- Fossil fuels also contain radioactive materials, mainly uranium and thorium, that are released into the atmosphere.
- F. Soddy's discovery (1910) that lead obtained by decay of uranium and of thorium differed in mass was considered a peculiarity of radioactive materials.
- Kurt Diebner and Dr Paul Harteck worked on uranium enrichment and a uranium based atomic bomb.
- TVA also provided much of the electricity needed for uranium enrichment at Oak Ridge, Tennessee, as required for the Manhattan Project.
- Faghihian said Iran has so far pumped out about 360 tons of the gas it needs for uranium enrichment and keeps the materials at the Isfahan facility.
- Mass spectrometers were used in the Manhattan Project for the separation of isotopes of uranium necessary to create the atomic bomb.
- The uranium used in the Manhattan Project to build the first atomic bomb was refined in Saint Louis by Mallinckrodt Chemical Co., starting in 1942.
- The Ames Project produced more than 2 million pounds (1,000 tons) of uranium for the Manhattan Project until industry took over the process in 1945.
- In 1896, Henri Becquerel discovered that a photographic plate was darkened in the prescence of uranium.
- In 1896, Henri Becquerel expanded the field of chemistry to include nuclear changes when he discovered that uranium emitted radiation.
- When Henri Becquerel spotted that photographic plates became fogged if kept in a drawer next to uranium salts, the discovery of radioactivity was immediate.
- Photographic plate of Becquerel impressed by the radioactivity of uranium.
- During the investigation of radioactivity he coined the terms alpha and beta to describe the two distinct types of radiation emitted by thorium and uranium.
- The radioactivity in MBq per gram of each of the platinum group metals which are formed by the fission of uranium, ruthenium is the most radioactive.
- Second, uranium which is not highly enriched, containing larger amounts of U-238, absorbs or "captures" too many of the neutrons needed for fission.
- The nucleus of U-238, for example, a well-known isotope of uranium, the 92nd and heaviest natural element, contains 92 protons and 146 neutrons.
- Uranium enrichment produces many tons of depleted uranium (DU) which consists of U-238 with most of the easily fissile U-235 isotope removed.
- Implosion systems can be built using either Pu-239 or U-235 but the gun assembly only works for uranium.
- For example, U-235 is an unstable isotope of uranium that has 92 protons and 143 neutrons in the nucl eus of each atom.
- The fissionable isotope of uranium, U-235, can be split by bombarding it with a slow, or thermal, neutron.
- Uranium has an atomic number of 92, so elements with larger atomic numbers are transuranium elements.
- Uranium is element number 92 in the periodic table, so elements with atomic numbers greater than 92 are said to be transuranium elements.
- Elements in this series with atomic numbers greater than that of uranium (92) are called transuranium elements.
- In 1938, the German chemist Otto Hahn, a student of Rutherford, directed neutrons onto uranium atoms expecting to get transuranium elements.
- When neutrons were bombarded on these uranium atoms at slow speeds, they were absorbed by the nucleus.
- In nature, uranium atoms exist as uranium-238 (99.284%), uranium-235 (0.711%), and a very small amount of uranium-234 (0.0058%).
- Elements heavier than iron only release energy when split, as was the case with the plutonium and uranium used in the first atomic bombs.
- Efforts to find other elements heavier that Uranium in the debris from atomic and Hydrogen bombs found several additional new elements.
- They are elements heavier than uranium with a higher atomic number than 92.
- Nature > Matter > Atoms > Isotopes
* Enriched Uranium
* Little Boy
* Natural Uranium
* Nuclear Fission
* Nuclear Reactors
* Uranium 235
* Uranium Atom
* Uranium Bomb
* Uranium Fission
* Uranium Isotopes
* Uranium Minerals
* Uranium Nuclei
* Uranium Nucleus
* Uranium Ore
* Uranium Ores
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