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Division Spotlight
Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
Meeting Spotlight
2025 ANS Annual Conference
June 15–18, 2025
Chicago, IL|Chicago Marriott Downtown
Standards Program
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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Latest News
Countering the nuclear workforce shortage narrative
James Chamberlain, director of the Nuclear, Utilities, and Energy Sector at Rullion, has declared that the nuclear industry will not have workforce challenges going forward. “It’s time to challenge the scarcity narrative,” he wrote in a recent online article. “Nuclear isn't short of talent; it’s short of imagination in how it attracts, trains, and supports the workforce of the future.”
K. Takeuchi, S. Tanaka, M. Kinno
Nuclear Science and Engineering | Volume 78 | Number 3 | July 1981 | Pages 273-283
Technical Paper | doi.org/10.13182/NSE81-A20304
Articles are hosted by Taylor and Francis Online.
For the transport calculation of gamma rays including bremsstrahlung, an improvement is made in the PALLAS-PL, SP discrete ordinates direct-integration code to enable evaluation of bremsstrahlung. The electrons resulting from Compton scattering, pair production, and the photoelectric effect are individually evaluated based on the primary gamma-ray flux calculated with the code. Bremsstrahlung production is then calculated by applying the continuous electron slowing down model. For this purpose, both the electron stopping power and the differential cross section for bremsstrahlung production are evaluated. Comparisons of PALLAS calculations with experiments are presented to test the validity of this code and method. As a result, it has been observed that the PALLAS calculations result in fairly good agreement with experiments, except for some discrepancies at energies below ∼0.7 MeV in the energy spectrum transmitted through lead and iron from a plane isotropic 6.2-MeV gamma-ray source. There is agreement also with another experiment on the attenuation by lead of transmission dose ∼8-MeV gamma rays in a normally incident from a plane monodirectional source. Further, there is agreement with the energy spectrum in lead calculated by a moments method for a plane monodirectional 8-MeV source without inclusion of secondary photons. Also presented are calculations of buildup factors and of energy spectra, including the contribution of bremsstrahlung, for a plane monodirectional beam of 8-MeV gamma rays normally incident on lead and on tungsten.
