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Characteristics A neutron-induced nuclear fission event involving uranium When refineduranium is a silvery white, weakly radioactive metal. It has a Mohs hardness of 6, sufficient to scratch glass and approximately equal to that of titaniumrhodiummanganese and niobium.
It is malleableductileslightly paramagneticstrongly electropositive and a poor electrical conductor. Uranium was the first isotope that was found to be fissile. Other naturally occurring isotopes are fissionable, but not fissile. On bombardment with slow neutrons, its uranium isotope will most of the time divide into two smaller nucleireleasing nuclear binding energy and more neutrons.
If too many of these neutrons are absorbed by other uranium nuclei, a nuclear chain reaction occurs that results in a burst of heat or in special circumstances an explosion. In a nuclear reactor, such a chain reaction is slowed and controlled by a neutron poisonabsorbing some of the free neutrons.
Such neutron absorbent materials are often part of reactor control rods see nuclear reactor physics for a description of this process of reactor control. As little as 15 lb 7 kg of uranium can be used to make an atomic bomb.
However, the first nuclear bomb the Gadget used at Trinity and the bomb that was detonated over Nagasaki Fat Man were both plutonium bombs. Orthorhombic, space group No. The major application of uranium in the military sector is in high-density penetrators. Tank armor and other removable http://lifescienceglobal.com/social/aziz-ansari-online-dating-ny-times/moms-dating-app.php armor can also be hardened with depleted uranium plates.
click The use of depleted uranium became politically and environmentally contentious after the use of such munitions by the US, UK and other countries during wars in the Persian Gulf and the Balkans raised questions concerning uranium compounds left in the soil see Gulf War syndrome. While the metal itself is radioactive, its high density makes it more effective than lead in halting radiation from strong sources such as radium.
During the later stages of World War IIthe entire Cold Warand to a lesser extent afterwards, uranium has been used as the fissile explosive material to produce nuclear weapons. Initially, two major types of fission bombs were built: a relatively simple device that uses uranium and a more complicated mechanism that uses plutonium derived from uranium Such bombs are jacketed in a non-fissile unenriched uranium case, and they derive more than half their power from the fission of this 100 percent free dating sites india by fast neutrons from the nuclear fusion process.
The main use of uranium in the civilian sector is to fuel nuclear power plants. Fuel used for United States Navy reactors is typically highly enriched in uranium the exact values are classified. In a breeder reactoruranium can also be converted into plutonium through the following reaction: .]
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