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  2. Joseph W. Kennedy - Wikipedia

    en.wikipedia.org/wiki/Joseph_W._Kennedy

    In February 1940, Glenn Seaborg and Edwin McMillan produced plutonium-239 by bombarding uranium with deuterons. This produced neptunium, element 93, which underwent beta-decay to form a new element, plutonium, with 94 protons. [4] Kennedy built a series of detectors and counters to verify the presence of plutonium.

  3. Weapons-grade nuclear material - Wikipedia

    en.wikipedia.org/wiki/Weapons-grade_nuclear_material

    Actinides [1] by decay chain Half-life range Fission products of 235 U by yield [2] 4n 4n + 1 4n + 2 4n + 3 4.5–7% 0.04–1.25% <0.001% 228 Ra № 4–6 a: 155 Eu þ: 248 Bk [3] > 9 a: 244 Cm ƒ: 241 Pu ƒ: 250 Cf 227 Ac № 10–29 a: 90 Sr 85 Kr 113m Cd þ: 232 U ƒ: 238 Pu ƒ: 243 Cm ƒ: 29–97 a: 137 Cs 151 Sm þ: 121m Sn 249 Cf ƒ: 242m ...

  4. Plutonium-239 - Wikipedia

    en.wikipedia.org/wiki/Plutonium-239

    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. Plutonium is classified according to the percentage of the contaminant plutonium-240 that it contains: Supergrade 23%; Weapons grade 3–7%; Fuel grade ...

  5. Enriched uranium - Wikipedia

    en.wikipedia.org/wiki/Enriched_uranium

    Enriched uranium is a type of uranium in which the percent composition of uranium-235 (written 235 U) has been increased through the process of isotope separation.Naturally occurring uranium is composed of three major isotopes: uranium-238 (238 U with 99.2732–99.2752% natural abundance), uranium-235 (235 U, 0.7198–0.7210%), and uranium-234 (234 U, 0.0049–0.0059%).

  6. Critical mass - Wikipedia

    en.wikipedia.org/wiki/Critical_mass

    If the density is 1% more and the mass 2% less, then the volume is 3% less and the diameter 1% less. The probability for a neutron per cm travelled to hit a nucleus is proportional to the density. It follows that 1% greater density means that the distance travelled before leaving the system is 1% less.

  7. When telling the history of plutonium, tell the full story ...

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  8. K-25 - Wikipedia

    en.wikipedia.org/wiki/K-25

    Rate 1 is the rate of effusion of 235 UF 6. Rate 2 is the rate of effusion of 238 UF 6. M 1 is the molar mass of 235 UF 6 ≈ 235 + 6 × 19 = 349 g·mol −1 M 2 is the molar mass of 238 UF 6 ≈ 238 + 6 × 19 = 352 g·mol −1. Uranium hexafluoride is a highly corrosive substance. It is an oxidant [22] and a Lewis acid which is able to bind to ...

  9. Nuclear reprocessing - Wikipedia

    en.wikipedia.org/wiki/Nuclear_reprocessing

    The first large-scale nuclear reactors were built during World War II.These reactors were designed for the production of plutonium for use in nuclear weapons.The only reprocessing required, therefore, was the extraction of the plutonium (free of fission-product contamination) from the spent natural uranium fuel.

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