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Congress receives NRC report on unusual events
The Nuclear Regulatory Commission has published its annual report to Congress for fiscal year 2023 on abnormal occurrences involving medical and industrial uses of radioactive material.
The report, which was announced by the NRC on May 3, is available on the NRC website.
Richard M. Christensen, Mildred S. Dresselhaus
Fusion Science and Technology | Volume 22 | Number 2 | September 1992 | Pages 271-277
Technical Paper | ICF Target | doi.org/10.13182/FST92-A30109
Articles are hosted by Taylor and Francis Online.
A symmetry-based criterion is developed for arranging source locations to produce a nearly spherically uniform, volumetric deformation of a spherical target. The criterion requires that the source coordinates be combined in a certain manner to form an isotropic second-rank tensor. This criterion, combined with a method for maximizing the symmetry, produces a sequence of preferred configurations given by4T, 6C, 121, 201, 301, 321, 421, 501, 601, and 621,where the integer is the number of sources and where T, C, and I refer, respectively, to specific tetrahedral, cubic, and icosahedral symmetry arrangements. The results are of interest for a generic class of problems involving the excitation of a spherical medium through mechanical, thermal, or electromagnetic energy deposition by discrete sources.