Sustained nuclear fission achieved solely by prompt neutron emission
In nuclear engineering, prompt criticality describes a nuclear fission event in which criticality (the threshold for an exponentially growing nuclear fission chain reaction) is achieved with prompt neutrons alone and does not rely on delayed neutrons. As a result, prompt supercriticality causes a much more rapid growth in the rate of energy release than other forms of criticality. Nuclear weapons are based on prompt criticality, while nuclear reactors rely on delayed neutrons or external neutrons to achieve criticality.
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In nuclear engineering, promptcriticality describes a nuclear fission event in which criticality (the threshold for an exponentially growing nuclear...
containing PromptPrompt neutron, in nuclear engineering Promptcriticality This disambiguation page lists articles associated with the title Prompt. If an...
solid sphere of 239Pu criticality is at 320 kg/m2, regardless of density, and for 235U at 550 kg/m2. In any case, criticality then depends upon a typical...
Prompt engineering is the process of structuring an instruction that can be interpreted and understood by a generative AI model. A prompt is natural language...
was to criticality with a tamper (layer of dense material surrounding the fissile material), but the core was accidentally put into a critical configuration...
Look up criticality in Wiktionary, the free dictionary. Criticality may refer to: Critical phenomena, the collective name associated with the physics of...
consisted of dangerous criticality testing, first with uranium in Otto Robert Frisch's experiments, and later with plutonium cores. Criticality testing involved...
supercriticality (or promptcriticality), which is the region in which nuclear weapons operate. The change in k needed to go from critical to promptcritical is defined...
performing criticality tests on the same plutonium core. After these two incidents it became known as the "demon core", and all similar criticality experiments...
and finally compresses the core (pit) of fissionable material to a promptcritical state. They are usually machined from a plastic bonded explosive and...
Reactor, in 1968. On 6 September 1968, this reactor was the site of a promptcritical excursion during commissioning tests. This accident harmed no personnel...
1990 by the International Atomic Energy Agency (IAEA) in order to enable prompt communication of safety significant information in case of nuclear accidents...
being the threshold of slow criticality, meaning a steady reaction rate, while 1 $ is the threshold of promptcriticality, which means a nuclear excursion...
received a lethal dose of radiation when an error caused it to enter promptcriticality. He died 25 days later, on September 15, 1945, from radiation poisoning...
pit. 'Urchin' initiated the nuclear chain reaction at the moment of prompt-criticality to ensure that the weapon did not fizzle. 'Urchin' was used in early...
forest fire. In nuclear physics, a single stray neutron can result in a promptcritical event, which may finally be energetic enough for a nuclear reactor...
causing a small portion of the core to reach a state of runaway promptcriticality and leading to a massive energy release, resulting in the explosion...
reaction also releases ~7 MeV in prompt gamma ray photons. The latter figure means that a nuclear fission explosion or criticality accident emits about 3.5%...
51% stakes respectively. PRINCE was derived from an earlier method called PROMPT II (Project Resource Organisation Management Planning Techniques). In 1989...
withdrawn and criticality is approached the number increases because the absorption of neutrons is being progressively reduced, until at criticality the chain...
requiring some fissile material to keep the reactor safely under promptcriticality: (e.g. 235 U in natural uranium and preferably also some moderator...
initially flowed into a more compact configuration, allowing it to reach promptcriticality (the same mechanism by which a fission weapon explodes, although with...
Nuclear Power Plant in the Ukrainian Soviet Socialist Republic reaches promptcriticality. December 23 – Rutan Voyager becomes the first aircraft to fly around...
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