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Reactor-grade plutonium
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Reactor-grade plutonium (RGPu) is the isotopic grade of plutonium that is found in spent nuclear fuel after the uranium-235 primary fuel that a nuclear power reactor uses has burnt up. The uranium-238 from which most of the plutonium isotopes derive by neutron capture is found along with the U-235 in the low enriched uranium fuel of civilian reactors.
An aerial photograph of the Trinity (nuclear test) crater shortly after the test. With an almost identical design to the Fat Man bomb used in Nagasaki
An aerial photograph of the Trinity (nuclear test) crater shortly after the test. With an almost identical design to the Fat Man bomb used in Nagasaki, both used what now would be defined as super weapons grade plutonium, It employed a natural uranium tamper that contributed approximately 1/4 of the final explosive energy and in total released an estimated energy of 22 kiloton or 22,000 tons of TNT equivalent. The smaller crater in the southeast corner was from
Tower of the Upshot–Knothole Ruth test. During the early development of nuclear explosive devices, available fissile material that differed from the c
Tower of the Upshot–Knothole Ruth test. During the early development of nuclear explosive devices, available fissile material that differed from the conventional special nuclear material forms, were tested. Pictured, is the results of a uranium hydride device. Post-shot limited structural damage from the fizzle explosion, estimated as equivalent to the same nuclear energy emitted as 200 tons of the chemical energy in TNT(0.2 kilotons) failed to demolish the testing tower, only somewhat damaging it.
The 200+ GWd/TU of burnup fuel-cycle, proposed in the 1990s Integral fast reactor(IFR) concept (color), an animation of the pyroprocessing technology
The 200+ GWd/TU of burnup fuel-cycle, proposed in the 1990s Integral fast reactor(IFR) concept (color), an animation of the pyroprocessing technology is also available. As opposed to the standard practice worldwide of PUREX separation, plutonium is not separated on its own in this pilot-scale, reprocessing cycle, rather all actinides are "electro-won" or "refined" from the "true waste" of fission products in spent fuel. The plutonium therefore instead comes over mixed with all the
A fresh nuclear fuel rod assembly bundle, being inspected before entering a reactor
A fresh nuclear fuel rod assembly bundle, being inspected before entering a reactor
Uranium-238
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Uranium-238 is the most common isotope of uranium found in nature, with a relative abundance of 99%. Unlike uranium-235, it is non-fissile, which means it cannot sustain a chain reaction in a thermal-neutron reactor. However, it is fissionable by fast neutrons, and is fertile, meaning it can be transmuted to fissile plutonium-239. 238U 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. Doppler broadening of 238U's neutron absorption resonances, increasing absorption as fuel temperature increases, is also an essential negative feedback mechanism for reactor control.
10 gram sample
10 gram sample