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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.
L. F. Hansen, T. Komoto, E. F. Plechaty, B. A. Pohl, G. S. Sidhu, C. Wong
Nuclear Science and Engineering | Volume 62 | Number 3 | March 1977 | Pages 550-558
Technical Paper | doi.org/10.13182/NSE77-A26991
Articles are hosted by Taylor and Francis Online.
The electron recoil spectra from gamma rays produced by the interaction of 14-MeV neutrons with 0.5, 1.0, 3.0, and 7.0 mean-free-paths (mfps) of nitrogen have been measured with NE-213 scintillators positioned at 26, 30, and 120 deg at distances ranging between 7 and 10 m. Thin wall spherical Dewars filled with liquid nitrogen, with radii dimensions equivalent to the above number of mfp, were bombarded with a centered nominal 14-MeV neutron source. Calculations of the gamma and recoil electron spectra have been carried out with the ENDF/B-IV and ENDL neutron-gamma libraries. Comparison between the measured and calculated electron recoil spectra shows that the discrepancies are not larger than 10%. This agreement implies that the calculated gamma-ray spectra are expected to give a good description of the gamma transport in nitrogen from a 14-MeV neutron source.