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Its composition varies, but for power generation, a typical mix contains slightly less than 20 percent by mass of the highly fissionable isotope uranium-235 (U-235).—IEEE Spectrum, 17 June 2024 In May the National Nuclear Security Administration released an investigation about four 2021 incidents: one criticality safety violation, one breach that resulted in skin contamination for three workers, and two flooding events that sent water toward fissionable materials.—Sarah Scoles, Scientific American, 14 Nov. 2023 The incidents included two separate floods, a glovebox breach, and an instance in which an unsafe amount of fissionable material was placed in a dropbox.—Time, 24 July 2023 Yet something was leaving Oak Ridge: Uranium 235, the fissionable isotope of the heaviest naturally occurring element on the planet.—Denise Kiernan, Rolling Stone, 17 July 2023 The most important step was separating the fissionable material from the conventional high explosives that trigger the nuclear reaction.—Phil Hoover, Discover Magazine, 20 Feb. 2012 The optimum would be to toss into the stream of discussion an AI outlier comment that would get everyone to go full-on fissionable red hot.—Lance Eliot, Forbes, 10 July 2022 Eisenhower proposed that governments make contributions from their stockpiles of uranium and fissionable materials to an international atomic-energy agency.—Rebecca Tuhus-Dubrow, The New Yorker, 19 Feb. 2021 Other fissionable atoms, Pu-239 for example, produce different suites of fission products.—Andrew Karam, Popular Mechanics, 7 Jan. 2016
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