51 relations: Arthur Jeffrey Dempster, Barium, Barn (unit), Boron, Cadmium, Chain reaction, Chemical element, Control rod, Critical mass, Delayed neutron, Electronvolt, Energy, Enriched uranium, Fissile material, Graphite-moderated reactor, Gun-type fission weapon, Hafnium, Half-life, Heavy water reactor, Isotopes of neptunium, Isotopes of protactinium, Isotopes of thorium, Isotopes of uranium, Krypton, Light water reactor, Little Boy, Mole (unit), Natural uranium, Neutron, Neutron capture, Neutron moderator, Neutron reflector, Neutron temperature, Nuclear cross section, Nuclear explosion, Nuclear fission, Nuclear fission product, Nuclear reactor, Nuclear weapon, Nuclear weapon design, Plutonium, Plutonium-239, Polonium, Popular Mechanics, Primordial nuclide, Radioactive decay, Tritium, Uranium-234, Uranium-236, Uranium-238, ..., Weapons-grade. Expand index (1 more) » « Shrink index
Arthur Jeffrey Dempster (August 14, 1886 - March 11, 1950) was a Canadian-American physicist best known for his work in mass spectrometry and his discovery of the uranium isotope 235U.
Barium is a chemical element with symbol Ba and atomic number 56.
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A barn (symbol b) is a unit of area.
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Boron is a chemical element with symbol B and atomic number 5.
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Cadmium is a chemical element with symbol Cd and atomic number 48.
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A chain reaction is a sequence of reactions where a reactive product or by-product causes additional reactions to take place.
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A chemical element (or element) is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei (i.e. the same atomic number, Z).
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Control rods are used in nuclear reactors to control the fission rate of uranium and plutonium.
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A critical mass is the smallest amount of fissile material needed for a sustained nuclear chain reaction.
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In nuclear engineering, a delayed neutron is a neutron emitted after a nuclear fission event, by one of the fission products (or actually, a fission product daughter after beta decay), any time from a few milliseconds to a few minutes after the fission event.
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In physics, the electronvolt (symbol eV; also written electron volt) is a unit of energy equal to approximately 160 zeptojoules (symbol zJ) or joules (symbol J).
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In physics, energy is a property of objects which can be transferred to other objects or converted into different forms, but cannot be created or destroyed.
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Enriched uranium is a type of uranium in which the percent composition of uranium-235 has been increased through the process of isotope separation.
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In nuclear engineering, fissile material is material capable of sustaining a nuclear fission chain reaction.
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A graphite reactor is a nuclear reactor that uses carbon as a neutron moderator, which allows un-enriched uranium to be used as nuclear fuel.
Gun-type fission weapons are fission-based nuclear weapons whose design assembles their fissile material into a supercritical mass by the use of the "gun" method: shooting one piece of sub-critical material into another.
Hafnium is a chemical element with symbol Hf and atomic number 72.
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Half-life (t1⁄2) is the amount of time required for the amount of something to fall to half its initial value.
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A pressurized heavy-water reactor (PHWR) is a nuclear power reactor, commonly using unenriched natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and moderator.
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Neptunium (Np) is an artificial element, and thus a standard atomic mass cannot be given.
Protactinium (Pa) has no stable isotopes.
Although thorium (Th), with atomic number 90, has 6 naturally occurring isotopes, none of these isotopes are stable; however, one isotope, 232Th, is relatively stable, with a half-life of 14.05 billion years, considerably longer than the age of the earth, and even slightly longer than the generally accepted age of the universe.
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Uranium (U) is a naturally occurring radioactive element that has no stable isotopes but two primordial isotopes (uranium-238 and uranium-235) that have long half-life and are found in appreciable quantity in the Earth's crust, along with the decay product uranium-234.
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Krypton (from κρυπτός kryptos "the hidden one") is a chemical element with symbol Kr and atomic number 36.
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The light water reactor (LWR) is a type of thermal-neutron reactor that uses normal water, as opposed to heavy water, as both its coolant and neutron moderator – furthermore a solid form of fissile elements is used as fuel.
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Little Boy was the codename for the type of atomic bomb dropped on the Japanese city of Hiroshima on 6 August 1945 by the Boeing B-29 Superfortress Enola Gay, piloted by Colonel Paul W. Tibbets, Jr., commander of the 509th Composite Group of the United States Army Air Forces.
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The mole is a unit of measurement for amount of substance.
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Natural uranium (NU, Unat) refers to uranium with the same isotopic ratio as found in nature.
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The neutron is a subatomic particle, symbol or, with no net electric charge and a mass slightly larger than that of a proton.
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Neutron capture is a nuclear reaction in which an atomic nucleus and one or more neutrons collide and merge to form a heavier nucleus.
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In nuclear engineering, a neutron moderator is a medium that reduces the speed of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235 or a similar fissile nuclide.
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A neutron reflector is any material that reflects neutrons.
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The neutron detection temperature, also called the neutron energy, indicates a free neutron's kinetic energy, usually given in electron volts.
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The nuclear cross section of a nucleus is used to characterize the probability that a nuclear reaction will occur.
A nuclear explosion is an explosion that occurs as a result of the rapid release of energy from a high-speed nuclear reaction.
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In nuclear physics and nuclear chemistry, nuclear fission is either a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into smaller parts (lighter nuclei).
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Nuclear fission products are the atomic fragments left after a large atomic nucleus undergoes nuclear fission.
A nuclear reactor, formerly known as atomic pile, is a device used to initiate and control a sustained nuclear chain reaction.
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A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion (thermonuclear weapon).
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Nuclear weapon designs are physical, chemical, and engineering arrangements that cause the physics package of a nuclear weapon to detonate.
Plutonium is a transuranic radioactive chemical element with symbol Pu and atomic number 94.
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Plutonium-239 is an isotope of plutonium.
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Polonium is a chemical element with symbol Po and atomic number 84, discovered in 1898 by Marie Curie and Pierre Curie.
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Popular Mechanics is a classic magazine of popular technology.
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In geochemistry and geonuclear physics, primordial nuclides, also known as primordial isotopes, are nuclides found on the Earth that have existed in their current form since before Earth was formed.
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Radioactive decay, also known as nuclear decay or radioactivity, is the process by which a nucleus of an unstable atom loses energy by emitting radiation.
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Tritium (or; symbol or, also known as hydrogen-3) is a radioactive isotope of hydrogen.
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Uranium-234 is an isotope of uranium.
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Uranium-236 is an isotope of uranium that is neither fissile with thermal neutrons, nor very good fertile material, but is generally considered a nuisance and long-lived radioactive waste.
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Uranium-238 (238U or U-238) is the most common isotope of uranium found in nature.
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A weapons-grade substance is one that is pure enough to be used to make a nuclear weapon or has properties that make it particularly suitable for nuclear weapons use.
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