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  2. Plutonium-239 - Wikipedia

    en.wikipedia.org/wiki/Plutonium-239

    Moreover, 239 Pu and 240 Pu cannot be chemically distinguished, so expensive and difficult isotope separation would be necessary to separate them. Weapons-grade plutonium is defined as containing no more than 7% 240 Pu; this is achieved by only exposing 238 U to neutron sources for short periods of time to minimize the 240 Pu produced.

  3. Pu-239 (film) - Wikipedia

    en.wikipedia.org/wiki/Pu-239_(film)

    Pu-239 is a 2006 British drama film written and directed by Hollywood producer Scott Z. Burns in his feature directorial debut, which was based on the book PU-239 and Other Russian Fantasies written by Ken Kalfus.

  4. Plutonium - Wikipedia

    en.wikipedia.org/wiki/Plutonium

    Neutrons from the fission of uranium-235 are captured by uranium-238 nuclei to form uranium-239; a beta decay converts a neutron into a proton to form neptunium-239 (half-life 2.36 days) and another beta decay forms plutonium-239. [28] Egon Bretscher working on the British Tube Alloys project predicted this reaction theoretically in 1940. [29]

  5. Reactor-grade plutonium - Wikipedia

    en.wikipedia.org/wiki/Reactor-grade_plutonium

    In contrast, the generic civilian Pressurized water reactor, routinely does (typical for 2015 Generation II reactor) 45 GWd/tU of burnup, resulting in the purity of Pu-239 being 50.5%, alongside a Pu-240 content of 25.2%, [5] [6] The remaining portion includes much more of the heat generating Pu-238 and Pu-241 isotopes than are to be found in ...

  6. Radioactive contamination from the Rocky Flats Plant

    en.wikipedia.org/wiki/Radioactive_contamination...

    The center is a 501(c)(3) non-profit corporation an, as of 2014, has one full-time employee. On October 15, 1983, about 10,000 demonstrators turned out for protest at the Rocky Flats Nuclear Weapons Plant (well short of the 21,000 hoped for by protest organizers). No arrests were made.

  7. Fission product yield - Wikipedia

    en.wikipedia.org/wiki/Fission_product_yield

    Fission product yields by mass for thermal neutron fission of U-235, Pu-239, a combination of the two typical of current nuclear power reactors, and U-233 used in the thorium fuel cycle If a graph of the mass or mole yield of fission products against the atomic number of the fragments is drawn then it has two peaks, one in the area zirconium ...

  8. Template:Attached KML/M-239 (Michigan highway) - Wikipedia

    en.wikipedia.org/.../M-239_(Michigan_highway)

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate

  9. Plutonium-240 - Wikipedia

    en.wikipedia.org/wiki/Plutonium-240

    The isotope 240 Pu has about the same thermal neutron capture cross section as 239 Pu (289.5 ± 1.4 vs. 269.3 ± 2.9 barns), [6] [7] but only a tiny thermal neutron fission cross section (0.064 barns). When the isotope 240 Pu captures a neutron, it is about 4500 times more likely to become plutonium-241 than to fission.

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