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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).
D. Brandt
Nuclear Science and Engineering | Volume 79 | Number 4 | December 1981 | Pages 333-339
Technical Paper | doi.org/10.13182/NSE81-A21385
Articles are hosted by Taylor and Francis Online.
A semianalytical method is developed for solving the stationary neutron transport equation in plane geometry. The angular variable is treated fully analytically, while the spatial dependence is approximated by the two-point Hermite method of arbitrary order k. The theory will be applied to a multigroup, multizone calculation of shields with PL scattering. Although the treatment is restricted to a k = 1 Hermite approximation, results are improved by introducing asymptotic coefficients simulating the k = ∞ case. Comparison with ANISN shows that the present method converges faster and leads to shorter computing times.