Plutonium 239 Fission

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In practice, however, reactor-bred plutonium will invariably contain a certain amount of Pu-240 due to the tendency of Pu-239 to absorb an additional neutron during production. Pu-240 has a high rate of spontaneous fission events (415,000 fission/s-kg), making it an undesirable contaminant. As a result, plutonium containing a significant fraction of Pu-240 is not well-suited to use in nuclear weapons; it emits neutron radiation, making handling more difficult, and its presence can lead to a "fizzle" in which a small explosion occurs, destroying the weapon but not causing fission of a significant fraction of the fuel. (However, in modern nuclear weapons using neutron generators for initiation and fusion boosting to supply extra neutrons, fizzling is not an issue. ) It is because of this limitation that plutonium-based weapons must be implosion-type, rather than gun-type. Moreover, Pu-239 and Pu-240 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% Pu-240; this is achieved by only exposing U-238 to neutron sources for short periods of time to minimize the Pu-240 produced.

Keywords: plutonium, plutonium halbwertszeit, plutonium kernkraftwerk, plutonium kaufen, plutonium 239, plutonium nitricum, plutonium spaltung, plutonium-238,


Plutonium is classified according to the percentage of the contaminant plutonium-240 that it contains:

Photogallery Plutonium 239 Fission:


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission


Plutonium 239 Fission