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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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Latest News
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.
D. Graham Foster, Jr.
Nuclear Science and Engineering | Volume 8 | Number 2 | August 1960 | Pages 148-156
Technical Paper | doi.org/10.13182/NSE60-A25790
Articles are hosted by Taylor and Francis Online.
The age to indium resonance of nearly monoenergetic 0.97-Mev neutrons from spherical Na-γ-Be sources has been measured in water and kerosene. The age from a point source is inferred by extrapolation from measurements made with sources ¾ and ⅜ in. in diameter. The flux age is 13.9 ± 0.2 cm2 in water and 13.8 ± 0.2 cm2 in kerosene. Calculations by the moments method give 13.9 ± 0.1 cm2 in each medium, in excellent agreement with the measurements. The thermal migration area measured concurrently is 21.5 ± 0.4 cm2 in water and 20.6 ± 0.4 cm2 in kerosene. The migration area calculated from the resonance age is 22.2 ± 0.5 cm2 in water and 21.8 ± 0.5 cm2 in kerosene. Both of these are substantially larger than the measured values.
