The NRX reactor provided Britain, the United States and Canada with a source of fissile plutonium and uranium-233.
2.
The higher the burn-up, the more plutonium in the spent fuel, but the lower the fraction of fissile plutonium.
3.
There would have been no need to bring A . Q . Khan if Pakistan had the capability to produce fissile plutonium in the early 70s.
4.
Pakistan had to bring Dr . A . Q . Khan from Europe to develop fissile uranium after PAEC failed to produce fissile plutonium by the 1976 deadline.
5.
Under Kistiakowsky's leadership, X-Division designed the complex explosive lenses needed to compress the fissile plutonium velocities of detonation in order to produce the required wave form.
6.
On the other extreme, separation of fissile plutonium-239 from the common impurity plutonium-240, while desirable in that it would allow the creation of gun-type nuclear weapons from plutonium, is generally agreed to be impractical.
7.
Many designs surround the core in a blanket of tubes that contain non-fissile uranium-238, which, by capturing fast neutrons from the reaction in the core, converts to fissile plutonium-239 ( as is some of the uranium in the core ), which is then reprocessed and used as nuclear fuel.
8.
It is not fissile, but is a fertile material : it can capture a slow neutron and after two beta decays become fissile plutonium-239 . Uranium-238 is fissionable by fast neutrons, but cannot support a chain reaction because inelastic scattering reduces neutron energy below the range where fast fission of one or more next-generation nuclei is probable.
9.
As the above two examples display, the odd numbered fissile plutonium isotopes present in spent nuclear fuel, such as Pu-239, decrease significantly as a percentage of the total composition of all plutonium isotopes ( which was 1.11 % in the first example above ) as higher and higher burnups take place, while the even numbered non-fissile plutonium isotopes increasingly accumulate in the fuel with time, e . g.
10.
As the above two examples display, the odd numbered fissile plutonium isotopes present in spent nuclear fuel, such as Pu-239, decrease significantly as a percentage of the total composition of all plutonium isotopes ( which was 1.11 % in the first example above ) as higher and higher burnups take place, while the even numbered non-fissile plutonium isotopes increasingly accumulate in the fuel with time, e . g.
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