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43 relations: Actinide, Allotropes of plutonium, Atomic nucleus, Barn (unit), Beryllium, Chernobyl disaster, Cosmic ray, Critical mass, Criticality accident, Density, Dollar (reactivity), Doppler broadening, Fissile material, Geometric and material buckling, Gun barrel, Gun-type fission weapon, Isotope separation, Kelvin, Little Boy, Louis Slotin, Mean free path, Monte Carlo method, Neutron, Neutron capture, Nicholas Metropolis, Nuclear chain reaction, Nuclear criticality safety, Nuclear cross section, Nuclear fission, Nuclear weapon, Nuclear weapon design, Optical depth, Prompt criticality, Prompt neutron, Random walk, Shape, Shaped charge, Spontaneous fission, Stanislaw Ulam, Temperature, Thin Man (nuclear bomb), Uranium-235, Uranium-238.
Actinide
The actinide or actinoid (IUPAC nomenclature) series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium.
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Allotropes of plutonium
Plutonium occurs in a variety of allotropes, even at ambient pressure.
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Atomic nucleus
The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment.
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Barn (unit)
A barn (symbol: b) is a unit of area equal to 10−28 m2 (100 fm2).
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Beryllium
Beryllium is a chemical element with symbol Be and atomic number 4.
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Chernobyl disaster
The Chernobyl disaster, also referred to as the Chernobyl accident, was a catastrophic nuclear accident.
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Cosmic ray
Cosmic rays are high-energy radiation, mainly originating outside the Solar System and even from distant galaxies.
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Critical mass
A critical mass is the smallest amount of fissile material needed for a sustained nuclear chain reaction.
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Criticality accident
A criticality accident is an uncontrolled nuclear fission chain reaction.
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Density
The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.
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Dollar (reactivity)
A dollar expresses the reactivity of a nuclear reactor relative to delayed and prompt criticality.
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Doppler broadening
In atomic physics, Doppler broadening is the broadening of spectral lines due to the Doppler effect caused by a distribution of velocities of atoms or molecules.
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Fissile material
In nuclear engineering, fissile material is material capable of sustaining a nuclear fission chain reaction.
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Geometric and material buckling
In a nuclear reactor, criticality is achieved when the rate of neutron production is equal to the rate of neutron losses, including total neutron absorption and total neutron leakage.
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Gun barrel
A gun barrel is a crucial part of gun-type ranged weapons such as small firearms, artillery pieces and air guns.
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Gun-type fission weapon
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.
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Isotope separation
Isotope separation is the process of concentrating specific isotopes of a chemical element by removing other isotopes.
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Kelvin
The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.
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Little Boy
"Little Boy" was the codename for the atomic bomb dropped on the Japanese city of Hiroshima on 6 August 1945 during World War II 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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Louis Slotin
Louis Alexander Slotin (1 December 1910 – 30 May 1946) was a Canadian physicist and chemist who worked on the Manhattan Project.
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Mean free path
In physics, the mean free path is the average distance traveled by a moving particle (such as an atom, a molecule, a photon) between successive impacts (collisions), which modify its direction or energy or other particle properties.
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Monte Carlo method
Monte Carlo methods (or Monte Carlo experiments) are a broad class of computational algorithms that rely on repeated random sampling to obtain numerical results.
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Neutron
| magnetic_moment.
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Neutron capture
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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Nicholas Metropolis
Nicholas Constantine Metropolis (Greek: Νικόλαος Μητρόπουλος, June 11, 1915 – October 17, 1999) was a Greek-American physicist.
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Nuclear chain reaction
A nuclear chain reaction occurs when one single nuclear reaction causes an average of one or more subsequent nuclear reactions, thus leading to the possibility of a self-propagating series of these reactions.
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Nuclear criticality safety
Nuclear criticality safety is a field of nuclear engineering dedicated to the prevention of nuclear and radiation accidents resulting from an inadvertent, self-sustaining nuclear chain reaction.
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Nuclear cross section
The nuclear cross section of a nucleus is used to characterize the probability that a nuclear reaction will occur.
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Nuclear fission
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 weapon
A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or from a combination of fission and fusion reactions (thermonuclear bomb).
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Nuclear weapon design
Nuclear weapon designs are physical, chemical, and engineering arrangements that cause the physics package of a nuclear weapon to detonate.
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Optical depth
In physics, optical depth or optical thickness, is the natural logarithm of the ratio of incident to transmitted radiant power through a material, and spectral optical depth or spectral optical thickness is the natural logarithm of the ratio of incident to transmitted spectral radiant power through a material.
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Prompt criticality
In nuclear engineering, prompt criticality is said to be reached during a nuclear fission event if one or more of the immediate or prompt neutrons released by an atom in the event causes an additional fission event resulting in a rapid, exponential increase in the number of fission events.
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Prompt neutron
In nuclear engineering, a prompt neutron is a neutron immediately emitted by a nuclear fission event, as opposed to a delayed neutron decay which can occur within the same context, emitted after beta decay of one of the fission products anytime from a few milliseconds to a few minutes later.
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Random walk
A random walk is a mathematical object, known as a stochastic or random process, that describes a path that consists of a succession of random steps on some mathematical space such as the integers.
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Shape
A shape is the form of an object or its external boundary, outline, or external surface, as opposed to other properties such as color, texture or material composition.
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Shaped charge
A shaped charge is an explosive charge shaped to focus the effect of the explosive's energy.
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Spontaneous fission
Spontaneous fission (SF) is a form of radioactive decay that is found only in very heavy chemical elements.
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Stanislaw Ulam
Stanisław Marcin Ulam (13 April 1909 – 13 May 1984) was a Polish-American scientist in the fields of mathematics and nuclear physics.
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Temperature
Temperature is a physical quantity expressing hot and cold.
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Thin Man (nuclear bomb)
"Thin Man" was the codename for a proposed plutonium gun-type nuclear bomb using plutonium-239 which the United States was developing during the Manhattan Project.
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Uranium-235
Uranium-235 (235U) is an isotope of uranium making up about 0.72% of natural uranium.
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Uranium-238
Uranium-238 (238U or U-238) is the most common isotope of uranium found in nature, with a relative abundance of 99%.
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Critical Size, Critical assembly, Critical configuration, Critical mass (nuclear), Critical size, Subcritical, Subcritical mass, Subcriticality, Supercritical mass, Supercriticality.
References
[1] https://en.wikipedia.org/wiki/Critical_mass
