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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. 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]

  4. Michigan Department of Licensing and Regulatory Affairs

    en.wikipedia.org/wiki/Michigan_Department_of...

    On March 18, 2015, Snyder signed an executive order to form the Michigan Agency for Energy with in LARA in 60 days. [7] On January 17, 2013, Governor Snyder ordered that the Office of Financial and Insurance Regulation be transferred out of the department to form a new Michigan Department of Insurance and Financial Services effective March 19 ...

  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...

    Plutonium-239 and 240 emit ionizing radiation in the form of alpha particles. Inhalation is the primary pathway by which plutonium enters the body, though plutonium can also enter the body through a wound. [51] Once inhaled, plutonium can increases the risk of lung cancer, liver cancer, bone cancer, and leukemia. [22]

  7. List of alpha emitting materials - Wikipedia

    en.wikipedia.org/wiki/List_of_alpha_emitting...

    Download as PDF; Printable version; In other projects ... 238 Pu, 239 Pu, 240 Pu, 244 Pu; 241 Am;

  8. Isotopes of plutonium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_plutonium

    The most stable are 244 Pu with a half-life of 80.8 million years; 242 Pu with a half-life of 373,300 years; and 239 Pu with a half-life of 24,110 years; and 240 Pu with a half-life of 6,560 years. This element also has eight meta states ; all have half-lives of less than one second.

  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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