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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.
J. K. Dickens
Nuclear Science and Engineering | Volume 50 | Number 2 | February 1973 | Pages 98-107
Technical Paper | doi.org/10.13182/NSE73-A23233
Articles are hosted by Taylor and Francis Online.
Interactions of neutrons with sodium have been studied by measuring gamma-ray-production cross sections. Spectra were obtained for incident mean neutron energies En = 4.85, 5.4, 5.9, 6.45, 7.0, and 7.5 MeV. Data were obtained at angles of 125 and 55 deg using Ge(Li) detectors. Time-of-flight was used to discriminate against pulses due to neutrons and background radiation.Absolute cross sections for production of gamma rays were obtained for the incident neutron energies quoted above. The data have been compared with previous inelastic neutron scattering results and evaluated cross sections, with good agreement. The spectra were studied for gamma rays which could be associated with deexcitation of nuclear levels having unknown decay modes. Gamma rays were found having energies appropriate for decay of levels at excitation energies Ex = 5762, 5934, 5967, 6115, 6576, and 6866 keV.