યુરેનિયમ: આવૃત્તિઓ વચ્ચેનો તફાવત

Content deleted Content added
No edit summary
No edit summary
લીટી ૭:
While uranium-238 has a small probability for [[spontaneous fission]] or even induced fission with fast neutrons, uranium-235 and to a lesser degree uranium-233 have a much higher fission cross-section for slow neutrons. In sufficient concentration, these isotopes maintain a sustained [[nuclear chain reaction]]. This generates the heat in nuclear power reactors, and produces the fissile material for [[nuclear weapon]]s. [[Depleted uranium]] (<sup>238</sup>U) is used in [[kinetic energy penetrator]]s and [[vehicle armour|armor plating]].<ref name="BuildingBlocks479">{{Harvnb|Emsley|2001|p=479}}.</ref>
 
યુરેનિયમ કાંચમાં રંગ દ્રવ્ય તરીકે યુરેનિયમનો ઉપયોગ થાય છે. જેમાં આ તત્વ કેસરી-લાલ થી પીળા રંગનો પ્રકાશ ઉત્પન્ન કરે છે. પ્રાચીન ફોટોગ્રાફીમાં છાયા ભેદ લાવવા આનો ઉપયોગ થતો હતો. આની શોધ ૧૭૮૯માં થઈ હતી. માર્ટિન હીનરીચ ક્લેપ્રોથ એ આની પીચબ્લેંડ નામની ખનિજમાંથેએખનિજમાંથી શોધી હતી. ૧૭૮૯માં પીચબ્લેંડનામની ખનિજમાંથી માર્ટિન હીનરીચ ક્લેપ્રોથ એ આ ધાતુની શોધ કરી હતી. અને આ ધાતુનું નામ [[યુરેનસ]] નામના ગ્રહ પરથી પાડ્યું હતું.
 
The 1789 [[discovery of the chemical elements|discovery]] of uranium in the mineral [[uraninite|pitchblende]] is credited to [[Martin Heinrich Klaproth]], who named the new element after the planet [[Uranus]]. [[Eugène-Melchior Péligot]] was the first person to isolate the metal and its radioactive properties were discovered in 1896 by [[Antoine Becquerel]]. Research by [[Enrico Fermi]] and others starting in 1934 led to its use as a fuel in the nuclear power industry and in ''[[Little Boy]]'', the [[Atomic bombings of Hiroshima and Nagasaki|first nuclear weapon used in war]]. An ensuing [[arms race]] during the [[Cold War]] between the [[United States]] and the [[Soviet Union]] produced tens of thousands of nuclear weapons that used uranium metal and uranium-derived [[plutonium-239]]. The security of those weapons and their fissile material following the [[Collapse of the Soviet Union (1985–1991)#Dissolution of the USSR|breakup of the Soviet Union]] in 1991 is an ongoing concern for public health and safety.<ref>[http://en.rian.ru/world/20100218/157925732.html "U.S. to pump money into nuke stockpile, increase security,"] ''RIA Novosti'' February 18, 2010</ref> See [[Nuclear proliferation]].