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Conference Spotlight
2025 ANS Winter Conference & Expo
November 8–12, 2025
Washington, DC|Washington Hilton
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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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Japan gets new U for enrichment as global power and fuel plans grow
President Trump is in Japan today, with a visit with new Prime Minister Sanae Takaichi on the agenda. Takaichi, who took office just last week as Japan’s first female prime minister, has already spoken in favor of nuclear energy and of accelerating the restart of Japan’s long-shuttered power reactors, as Reuters and others have reported. Much of the uranium to power those reactors will be enriched at Japan’s lone enrichment facility—part of Japan Nuclear Fuel Ltd.’s Rokkasho fuel complex—which accepted its first delivery of fresh uranium hexafluoride (UF₆) in 11 years earlier this month.
W. Reed Johnson, Daniel H. Risher, James E. Rogers, William L. Thompson
Nuclear Science and Engineering | Volume 43 | Number 1 | January 1971 | Pages 32-41
Technical Paper | doi.org/10.13182/NSE71-A21243
Articles are hosted by Taylor and Francis Online.
Well-collimated beams of thermal-neutron-capture gamma rays from titanium and nickel, having average energies of about 6 and 8 MeV, respectively, were used to measure narrow-beam and total gamma-ray dose attenuation. Slab shields of lead, iron, and concrete were investigated for normal and oblique beam incidence. Total dose measurements were made by traversing an exposure-responsive detector through a plane behind and parallel to the shield. Monte Carlo and moments-method calculations were used to compare analytical and experimental total dose results. Good agreement was found for iron and concrete shields, but experimental results for the lead shield were higher than those predicted by the moments method by a factor of ∼1.2 for 6 MeV and ∼1.5 for 8 MeV. The reason for this disagreement is believed to be primarily bremsstrah-lung produced by energetic secondary electrons slowing down in lead.
