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Perpetual Atomics, QSA Global produce Am fuel for nuclear space power
U.K.-based Perpetual Atomics and U.S.-based QSA Global claim to have achieved a major step forward in processing americium dioxide to fuel radioisotope power systems used in space missions. Using an industrially scalable process, the companies said they have turned americium into stable, large-scale ceramic pellets that can be directly integrated into sealed sources for radioisotope power systems, including radioisotope heater units (RHUs) and radioisotope thermoelectric generators (RTGs).
S. Nizamuddin, J. Blons
Nuclear Science and Engineering | Volume 54 | Number 2 | June 1974 | Pages 116-126
Technical Paper | doi.org/10.13182/NSE74-A23400
Articles are hosted by Taylor and Francis Online.
The fission cross section of 233U, measured at liquid nitrogen temperature, has been analyzed between 6 and 124 eV by a single-level formalism. The resonance parameters E, Γ, and σ0Γƒ are presented. These parameters are shown to represent the measured cross section quite well provided that, in addition to the 136 well-resolved resonances, 33 somewhat broad levels (Γ > 500 meV) are added in the vicinity of some of the highly asymmetric resonances. The distributions of the nearest neighbor level spacings are compared with the Wigner distributions. The fission widths, Γƒ, have also been derived for only well-resolved resonances, using a constant value of the radiation width, Γγ = 39 meV. The distribution of these widths compares favorably with a X2 distribution with v = 3 degrees-of-freedom.