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
2026 ANS Annual Conference
May 31–June 3, 2026
Denver, CO|Sheraton Denver
Latest Magazine Issues
May 2026
Jan 2026
2026
Latest Journal Issues
Nuclear Science and Engineering
June 2026
Nuclear Technology
Fusion Science and Technology
Latest News
NRC proposes changes to its rules on nuclear materials
In response to Executive Order 14300, “Ordering the Reform of the Nuclear Regulatory Commission,” the NRC is proposing sweeping changes to its rules governing the use of nuclear materials that are widely used in industry, medicine, and research. The changes would amend NRC regulations for the licensing of nuclear byproduct material, some source material, and some special nuclear material.
As published in the May 18 Federal Register, the NRC is seeking public comment on this proposed rule and draft interim guidance until July 2.
Eldon Schmidt, Philip F. Rose
Nuclear Science and Engineering | Volume 84 | Number 3 | July 1983 | Pages 300-304
Technical Note | doi.org/10.13182/NSE83-A17800
Articles are hosted by Taylor and Francis Online.
A modern continuous energy-angle Monte Carlo program has been used to perform neutron shielding calculations for a fusion shield. The SAM-CE Monte Carlo program developed by the Mathematical Applications Group has been used for a demonstration calculation of an Oak Ridge National Laboratory fusion shield benchmark with a deuterium-tritium neutron source. Calculations were made for three shielding configurations. They were compared with experiment and also with previous calculations using Sn with first- and last-flight modifications. Agreement with experiment was found to be good at high (>14-MeV) and low (<5-MeV) energies. At intermediate energies where the fluxes are much lower, the agreement was less accurate differing by as much as factors of 2 or 3 in extreme cases. An improved resolution broadening function for the NE-213 detectors helped reduce some of these differences.