- published: 18 Dec 2012
- views: 224070
Uranium-235 (235U) is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a fission chain reaction. It is the only fissile isotope that is a primordial nuclide or found in significant quantity in nature.
Uranium-235 has a half-life of 703.8 million years. It was discovered in 1935 by Arthur Jeffrey Dempster. Its (fission) nuclear cross section for slow thermal neutrons is about 584.994 barns. For fast neutrons it is on the order of 1 barn. Most but not all neutron absorptions result in fission; a minority result in neutron capture forming uranium-236.
The fission of one atom of U-235 generates 202.5 MeV = 3.24 × 10−11 J, which translates to 19.54 TJ/mol, or 83.14 TJ/kg. When 235
92U nuclides are bombarded with neutrons, one of the many fission reactions that it can undergo is the following (shown visually in the image to the left):
Heavy water reactors, and some graphite moderated reactors can use unenriched uranium, but light water reactors must use low enriched uranium because of light water's neutron absorption. Uranium enrichment removes some of the uranium-238 and increases the proportion of uranium-235. Highly enriched uranium (HEU), which contains an even greater proportion of U-235, is sometimes used in nuclear weapon design.
This physics video explains the concept of nuclear fission reaction by illustrating an example of nuclear fission of Uranium 235 atom. Nuclear fission is nuclear reaction process in which nucleus, when bombarded with a neutron, splits into smaller parts, often producing free neutrons, and releasing a very large amount of energy. One of the most important applications of nuclear fission reactions in creating chain reactions.
http://helpfulwaves.blogspot.com/2015/06/human-pattern-recognition-of-molecular.html I extracted the area-specific molecular magnetic field of weapons grade Uranium - 235 during nuclear fission (detonation) from audio recorded at the Nevada test site region in the 1950s. The field approximation as a compound frequency is 2022, 3517, 8437 Hz. See Upshot-Knothole Grable: http://en.wikipedia.org/wiki/Upshot-Knothole_Grable This is a molecular magnetic field approximation of what a fission bomb would feel like as a designer electromagnetic field. One day a machine will be able match molecular fields in the same way that I do by hand. This opens the door to matching molecular magnetic fields remotely or in this scenario, detecting the presence of weapons grade uranium 235 prior to detonati...
Uranium-235 is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a fission chain reaction. It is the only fissile isotope that is a primordial nuclide or found in significant quantity in nature. Uranium-235 has a half-life of 703.8 million years. It was discovered in 1935 by Arthur Jeffrey Dempster. Its (fission) nuclear cross section for slow thermal neutrons is about 504.81 barns. For fast neutrons it is on the order of 1 barn. Most but not all neutron absorptions result in fission; a minority result in neutron capture forming uranium-236. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
This video is part of an all nuclear playlist: https://www.youtube.com/playlist?list=PLlbis7m6MHoEh6dc23kz22kW_Fcrd7LHO
This video is part of an all nuclear playlist: https://www.youtube.com/playlist?list=PLlbis7m6MHoEh6dc23kz22kW_Fcrd7LHO
We already know that uranium is the basis of most of nuclear reactions. It consists of two major isotopes: the 235 and 238. Uranium 238 can be found abundantly in nature, while 235 isotope is much more rare. Ironically, the rare Uranium 235 is the one needed for most nuclear reactions. Fortunately, the separation of uranium isotope is very complicated, that is why only few Countries can afford it. Meanwhile, chemists and physicists prefer to use depleted form of uranium for laboratory use since it only contains about 0,2% of real thing.
Apparently, by April 1945, House of Bernadotte had managed to produce Uranium-235 at the Halden Reactor in Norway, which Maria Quisling, Hauge & Co supplied to the Manhattan Project in exchange for 'Safe Haven' for Hitler (Ørland AB) and Jonas Lie (Bakehuset Ubåtbyen Bergen) -- Kriegsmarine U-234 departed Kristiansand for Japan on 15 April 1945, running submerged at snorkel depth for the first 16 days. The voyage proceeded without incident; the first sign that world affairs were overtaking the voyage was when the Kriegsmarine 's Goliath transmitter stopped transmitting, followed shortly after by the Nauen station. Fehler did not know it, but Germany's naval HQ had fallen into Allied hands. Then, on 4 May, U-234 received a fragment of a broadcast from British and American radio stations a...
"Uranium" is a chemical element with symbol "U" and atomic number 92. It is a silvery-white metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium is weakly radioactive because all its isotopes are unstable . The most common isotopes of uranium are uranium-238 and uranium-235 . Uranium has the second highest atomic weight of the primordially occurring elements, lighter only than plutonium. Its density is about 70% higher than that of lead, but slightly lower than that of gold or tungsten. It occurs naturally in low concentrations of a few parts per million in soil, rock and water, and is commercially extracted from uranium-bearing minerals such as uraninite. In nature, uranium is found as uranium-...