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Californium-252 production diagram Californium-252 (Cf-252, 252 Cf) undergoes spontaneous fission with a branching ratio of 3.09% and is used in small neutron sources . Fission neutrons have an energy range of 0 to 13 MeV with a mean value of 2.3 MeV and a most probable value of 1 MeV.
The high spontaneous fission rate of californium-252 was observed in these samples. The first experiment with californium in concentrated form occurred in 1958. [ 28 ] The isotopes 249 Cf to 252 Cf were isolated that same year from a sample of plutonium-239 that had been irradiated with neutrons in a nuclear reactor for five years. [ 12 ]
Rather than relying solely on a large amount of californium for neutrons, the multiplier effect of 3.5 pounds of uranium initiated by only a few milligrams of 252 Cf provided a higher ultimate neutron flux at a lower cost. The CFX was designed by IRT Corporation, [1] with two devices manufactured.
Some isotopes undergo spontaneous fission (SF) with emission of neutrons.The most common spontaneous fission source is the isotope californium-252. 252 Cf and all other SF neutron sources are made by irradiating uranium or a transuranic element in a nuclear reactor, where neutrons are absorbed in the starting material and its subsequent reaction products, transmuting the starting material into ...
Download as PDF; Printable version; In other projects Wikidata item; Appearance. move to sidebar hide. ... Californium-255; Californium-256; Cf-252 This page was ...
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californium-249m: 45 radon-216: 45 ... lawrencium-252: 390 polonium-194: 392 bismuth-200m2: ... The PDF of this article lists the half-lives of all known radioactives ...
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