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2026 Annual Conference
May 31–June 3, 2026
Denver, CO|Sheraton Denver
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The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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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).
F. C. Difilippo, R. B. Perez, G. de Saussure, D. K. Olsen, R. W. Ingle
Nuclear Science and Engineering | Volume 63 | Number 2 | June 1977 | Pages 153-166
Technical Paper | doi.org/10.13182/NSE77-A27019
Articles are hosted by Taylor and Francis Online.
We have measured the neutron-induced 238U subthreshold fission cross section in the neutron energy range between 0.6 and 100 keV. A total of 28 fission clusters were identified. The well-known clusters at 721 and 1210 eV appeared resolved into their Class I components. Average 238U subthreshold fission cross sections were determined and compared with available results in the literature. We interpreted the measurement in terms of fission doorway (Class II levels) arising from the assumption of the existence of a double-humped fission barrier for the (238U + n) compound nucleus at large deformations. On the basis of this model, several fission barrier parameters were determined.
