Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Uranium-234> ?p ?o }
- Uranium-234 abstract "Uranium-234 is an isotope of uranium. In natural uranium and in uranium ore, U-234 occurs as an indirect decay product of uranium-238, but it makes up only 0.0055% (55 parts per million) of the raw uranium because its half-life of just 245,500 years is only about 1/18,000 as long as that of U-238. The primary path of production of U-234 via nuclear decay is as follows: U-238 nuclei emit an alpha particle to become thorium-234 (Th-234). Next, with a short half-life, Th-234 nuclei emit a beta particle to become protactinium-234 (Pa-234). Finally, Pa-234 nuclei emit another beta particle to become U-234 nuclei.U-234 nuclei decay by alpha emission to thorium-230, except for the tiny fraction (parts per billion) of nuclei which undergo spontaneous fission.Extraction of rather small amounts of U-234 from natural uranium would be feasible using isotope separation, similar to that used for regular uranium-enrichment. However, there is no real demand in chemistry, physics, or engineering for isolating U-234. Very small pure samples of U-234 can be extracted via the chemical ion-exchange process - from samples of plutonium-238 that have been aged somewhat to allow some decay to U-234 via alpha emission.Enriched uranium contains more U-234 than natural uranium as a byproduct of the uranium enrichment process aimed at obtaining U-235, which concentrates lighter isotopes even more strongly than it does U-235. The increased percentage of U-234 in enriched natural uranium is acceptable in current nuclear reactors, but (re-enriched) reprocessed uranium might contain even higher fractions of U-234, which is undesirable. This is because U-234 is not fissile, and tends to absorb slow neutrons in a nuclear reactor - becoming U-235.U-234 has a neutron-capture cross-section of about 100 barns for thermal neutrons, and about 700 barns for its resonance integral - the average over neutrons having various intermediate energies. In a nuclear reactor non-fissile isotopes capture a neutron breeding fissile isotopes. U-234 is converted to U-235 more easily and therefore at a greater rate than U-238 is to Pu-239 (via neptunium-239) because U-238 has a much smaller neutron-capture cross-section of just 2.7 barns.However, (n, 2n) reactions with fast neutrons also convert small amounts of U-235 to U-234, so that spent nuclear fuel may contain about 0.010% U-234, a much higher fraction than in non-irradiated uranium.Depleted uranium contains much less U-234 (around 0.001%) which makes the radioactivity of depleted uranium about one-half of that of natural uranium. Natural uranium has an \"equilibrium\" concentration of U-234 at the point where an equal number of decays of U-238 and U-234 will occur. Depleted uranium also contains less U-235, but in spite of its half-life that is much shorter than the one of U-238, the concentration of U-235 in natural uranium is low enough (about 0.7%) so that the U-235 depletion does not result in a significant reduction in radioactivity.".
- Uranium-234 wikiPageID "1898583".
- Uranium-234 wikiPageLength "4920".
- Uranium-234 wikiPageOutDegree "52".
- Uranium-234 wikiPageRevisionID "683763920".
- Uranium-234 wikiPageWikiLink Alpha_decay.
- Uranium-234 wikiPageWikiLink Alpha_particle.
- Uranium-234 wikiPageWikiLink Barn_(unit).
- Uranium-234 wikiPageWikiLink Beta_decay.
- Uranium-234 wikiPageWikiLink Beta_particle.
- Uranium-234 wikiPageWikiLink By-product.
- Uranium-234 wikiPageWikiLink Category:Actinides.
- Uranium-234 wikiPageWikiLink Category:Fertile_materials.
- Uranium-234 wikiPageWikiLink Category:Isotopes_of_uranium.
- Uranium-234 wikiPageWikiLink Chemistry.
- Uranium-234 wikiPageWikiLink Decay_product.
- Uranium-234 wikiPageWikiLink Depleted_uranium.
- Uranium-234 wikiPageWikiLink Engineering.
- Uranium-234 wikiPageWikiLink Enriched_uranium.
- Uranium-234 wikiPageWikiLink Fissile_material.
- Uranium-234 wikiPageWikiLink Half-life.
- Uranium-234 wikiPageWikiLink Ion_exchange.
- Uranium-234 wikiPageWikiLink Isotope_separation.
- Uranium-234 wikiPageWikiLink Isotopes_of_neptunium.
- Uranium-234 wikiPageWikiLink Isotopes_of_protactinium.
- Uranium-234 wikiPageWikiLink Isotopes_of_thorium.
- Uranium-234 wikiPageWikiLink Isotopes_of_uranium.
- Uranium-234 wikiPageWikiLink Natural_uranium.
- Uranium-234 wikiPageWikiLink Neptunium.
- Uranium-234 wikiPageWikiLink Neutron.
- Uranium-234 wikiPageWikiLink Neutron_capture.
- Uranium-234 wikiPageWikiLink Neutron_cross_section.
- Uranium-234 wikiPageWikiLink Neutron_temperature.
- Uranium-234 wikiPageWikiLink Nuclear_reactor.
- Uranium-234 wikiPageWikiLink Parts-per_notation.
- Uranium-234 wikiPageWikiLink Physics.
- Uranium-234 wikiPageWikiLink Plutonium-238.
- Uranium-234 wikiPageWikiLink Positron_emission.
- Uranium-234 wikiPageWikiLink Protactinium.
- Uranium-234 wikiPageWikiLink Radioactive_decay.
- Uranium-234 wikiPageWikiLink Reprocessed_uranium.
- Uranium-234 wikiPageWikiLink Spent_nuclear_fuel.
- Uranium-234 wikiPageWikiLink Spontaneous_fission.
- Uranium-234 wikiPageWikiLink Thermal-neutron_reactor.
- Uranium-234 wikiPageWikiLink Uranium-233.
- Uranium-234 wikiPageWikiLink Uranium-235.
- Uranium-234 wikiPageWikiLink Uranium-238.
- Uranium-234 wikiPageWikiLink Uranium-uranium_dating.
- Uranium-234 wikiPageWikiLinkText "".
- Uranium-234 wikiPageWikiLinkText "U-234".
- Uranium-234 wikiPageWikiLinkText "Uranium II".
- Uranium-234 wikiPageWikiLinkText "Uranium-234".
- Uranium-234 wikiPageWikiLinkText "uranium-234".
- Uranium-234 abundance "0.0054".
- Uranium-234 after Isotopes_of_thorium.
- Uranium-234 background "#fc6".
- Uranium-234 before Plutonium-238.
- Uranium-234 before "neptunium-234".
- Uranium-234 before "protactinium-234".
- Uranium-234 decayMass "230".
- Uranium-234 decayMode Alpha_decay.
- Uranium-234 decayMode Spontaneous_fission.
- Uranium-234 decayProduct "thorium-230".
- Uranium-234 decaySymbol "Th".
- Uranium-234 element "uranium".
- Uranium-234 halflife "7.7631696E12".
- Uranium-234 heavier Uranium-235.
- Uranium-234 isotopeName "uranium-234".
- Uranium-234 lighter Uranium-233.
- Uranium-234 massNumber "234".
- Uranium-234 numNeutrons "142".
- Uranium-234 numProtons "92".
- Uranium-234 parent "plutonium-238".
- Uranium-234 parent "protactinium-234".
- Uranium-234 parent "uranium-238".
- Uranium-234 parent2Decay "b-".
- Uranium-234 parent2Mass "234".
- Uranium-234 parent2Symbol "Pa".
- Uranium-234 parent3Decay "a".
- Uranium-234 parent3Mass "238".
- Uranium-234 parent3Symbol "Pu".
- Uranium-234 parentDecay "alpha, beta, beta".
- Uranium-234 parentMass "238".
- Uranium-234 parentSymbol "U".
- Uranium-234 symbol "U".
- Uranium-234 wikiPageUsesTemplate Template:Infobox_isotope.
- Uranium-234 wikiPageUsesTemplate Template:Isotope.
- Uranium-234 wikiPageUsesTemplate Template:Reflist.
- Uranium-234 subject Category:Actinides.
- Uranium-234 subject Category:Fertile_materials.
- Uranium-234 subject Category:Isotopes_of_uranium.
- Uranium-234 hypernym Isotope.
- Uranium-234 type Drug.
- Uranium-234 type Group.
- Uranium-234 type Actinide.
- Uranium-234 type Group.
- Uranium-234 type Isotope.
- Uranium-234 comment "Uranium-234 is an isotope of uranium. In natural uranium and in uranium ore, U-234 occurs as an indirect decay product of uranium-238, but it makes up only 0.0055% (55 parts per million) of the raw uranium because its half-life of just 245,500 years is only about 1/18,000 as long as that of U-238. The primary path of production of U-234 via nuclear decay is as follows: U-238 nuclei emit an alpha particle to become thorium-234 (Th-234).".
- Uranium-234 label "Uranium-234".
- Uranium-234 sameAs Q2153640.