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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.
E. M. Fournie, A. B. Chilton
Nuclear Science and Engineering | Volume 76 | Number 1 | October 1980 | Pages 66-69
Technical Note | doi.org/10.13182/NSE80-2
Articles are hosted by Taylor and Francis Online.
Monte Carlo calculations have been made for the penetration of slab shields by gamma radiation of monoenergetic character. The radiation is in the form of parallel, broad beams incident on the front face of the slab at various angles having cosines between 0.25 and 1.0. The beam photon energies vary between 0.661 and 6.13 MeV. The slab thicknesses extend to 10 mean-free-paths. The results are provided in the form of tables and graphs for exposure transmission buildup factors as a function of slab thicknesses. Comparison with previous work shows good agreement; however, this work goes somewhat beyond previous contributions.
