ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Explore membership for yourself or for your organization.
Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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!
Latest Magazine Issues
Aug 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
August 2025
Fusion Science and Technology
Latest News
General Matter to build Kentucky enrichment plant under DOE lease
The Department of Energy’s Office of Environmental Management announced it has signed a lease with General Matter for the reuse of a 100-acre parcel of federal land at the former Paducah Gaseous Diffusion Plant in Kentucky for a new private-sector domestic uranium enrichment facility.
Takashi Nakamura, Toshiso Kosako, Katsumi Hayashi, Shuichi Ban, Kazuaki Katoh
Nuclear Science and Engineering | Volume 77 | Number 2 | February 1981 | Pages 182-191
Technical Paper | doi.org/10.13182/NSE81-A21352
Articles are hosted by Taylor and Francis Online.
The dose distribution and the spectrum variation of neutrons due to the skyshine effect have been measured with various detectors in the environment surrounding the electron synchrotron of the Institute for Nuclear Study, University of Tokyo. The dose distribution and the spectra of neutrons on the outer surface of the concrete shield of the synchrotron building were also measured in order to get information on the skyshine source. The measured neutron spectra both at the source and in the environment show an approximate 1/E spectrum below ∼100 keV, but the latter is much softer than the former above that energy. These experimental data were analyzed with the multigroup Monte Carlo code, MMCR, with the result that the calculated results are in good agreement with the experiment. This experiment is uniquely worthwhile since the skyshine of the radiation directed almost vertically into the air from the accelerator building was measured and the energy spectrum and dose distributions of the neutron source were clarified.