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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).
R. M. Rubin
Nuclear Science and Engineering | Volume 47 | Number 2 | February 1972 | Pages 221-224
Technical Paper | doi.org/10.13182/NSE72-A22399
Articles are hosted by Taylor and Francis Online.
The exposure angular distributions above various ring isotropic and disk isotropic 60Co sources have been calculated in a constant density air medium and compared to Monte Carlo calculations and experimental data for the same sources located at the interface between air and ground. The effect of the interface for ring sources is found to be very similar to the expected results for point sources. For disk sources, the interface effects on the exposure angular distribution are presented as a ratio which has a simple exponential dependence on the cosine of the angle. The results for a very large disk (infinite plane isotropic source) yield correction factors to the assumption that earth can be treated as condensed air.
