Plutonium-239 (239Pu or Pu-239) is an isotope of plutonium. Plutonium-239 is the primary fissile isotope used for the production of nuclear weapons, although...

Thorium–uranium–plutonium was investigated as a nuclear fuel for fast breeder reactors. Trace amounts of plutonium-238, plutonium-239, plutonium-240, and plutonium-244...

8 million years; plutonium-242 with a half-life of 373,300 years; and plutonium-239 with a half-life of 24,110 years; and plutonium-240 with a half-life...

Plutonium-238 (238Pu or Pu-238) is a radioactive isotope of plutonium that has a half-life of 87.7 years. Plutonium-238 is a very powerful alpha emitter;...

uranium-235 and plutonium-239 in the element used must be sufficiently high. Uranium from natural sources is enriched by isotope separation, and plutonium is produced...

Plutonium-240 (240 Pu or Pu-240) is an isotope of plutonium formed when plutonium-239 captures a neutron. The detection of its spontaneous fission led...

original working title. Pu-239 is the chemical symbol for plutonium-239 (239Pu), a radioactive isotope of the chemical element plutonium. Timofey Berezin (Paddy...

fast neutrons and is fertile, meaning it can be transmuted to fissile plutonium-239 in a nuclear reactor. Another fissile isotope, uranium-233, can be produced...

mid-20th century, plutonium in the environment has been primarily produced by human activity. The first plants to produce plutonium for use in cold war...

fast neutrons, and is fertile, meaning it can be transmuted to fissile plutonium-239. 238U cannot support a chain reaction because inelastic scattering reduces...

superior to plutonium in rare circumstances. It was claimed that if the existing weapons were based on uranium-233 instead of plutonium-239, Livermore...

capture include: plutonium-238 which converts into plutonium-239 plutonium-240 which converts into plutonium-241 Some other actinides need more than one neutron...

nuclear fission of uranium-235, whereas Thin Man was based on fission of plutonium-239. Fission was accomplished by shooting a hollow cylinder (the "bullet")...

isotope 239Pu into a number of other isotopes of plutonium that are less fissile or more radioactive. When 239 Pu absorbs a neutron, it does not always undergo...

two major fissile fuels, uranium-235 and plutonium-239; it is also lower than that of short-lived plutonium-241, but bested by very difficult-to-produce...

(primarily plutonium, americium, and uranium) contamination within and outside its boundaries. The contamination primarily resulted from two major plutonium fires...

sprayed in the face with liquid plutonium chloride, causing him to accidentally swallow some. Plutonium-238 and plutonium-239 are exceedingly difficult to...

on 15 August brought the war to a close first. The Third Shot was a plutonium-239-based implosion bomb of the "Fat Man" design, similar to the bomb that...

primarily support the validation of design parameters for development of plutonium-239 powered nuclear weapons. On the twentieth anniversary of the 1974 Pokhran...

(Pu/U)0 time dependence. Unlike plutonium-238, plutonium-239, plutonium-240, plutonium-241, and plutonium-242, plutonium-244 is not produced in quantity...

mass of plutonium, which limited the achievable yield to about 10 kt, or using highly pure plutonium-239 with impractically low level of plutonium-240 contamination...

enriched uranium Plutonium-239, bred from uranium-238 by neutron capture with intermediate decays steps omitted. Plutonium-241, bred from plutonium-240 directly...

natural (not isotopically enriched) uranium metal into plutonium-239 by neutron activation, as plutonium is simpler to chemically separate from spent fuel...

gram per hour for plutonium-239. This meant that reactor-bred plutonium was unsuitable for use in a gun-type weapon. The plutonium-240 would start the...

decays, uranium-238 becomes plutonium-239, which, by successive neutron capture, becomes plutonium-240, plutonium-241, plutonium-242, and (after further beta...

insoluble. The plutonium-238 used in these RTGs has a half-life of 87.74 years, in contrast to the 24,110 year half-life of plutonium-239 used in nuclear...

a large fissile atomic nucleus such as uranium-235, uranium-233, or plutonium-239 absorbs a neutron, it may undergo nuclear fission. The heavy nucleus...

daughter yttrium-90, 9.12 TBq (4.0 kg) of plutonium-239 (half-life 24,100 years), 1.14 TBq (0.29 g) of plutonium-241 (half-life 14 years) as well as smaller...

activist Karen Silkwood found herself exposed to plutonium-239 after working to grind and polish plutonium pellets by way of a glovebox to be used in nuclear...

efficient use of scarce fissile material such as uranium-235 (235 U ) or plutonium-239 (239 Pu ). The first full-scale thermonuclear test was carried out by the...