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Critical Reflector Thicknesses for Spherical U233 and Pu239 Systems

E. A. Plassmann, D. P. Wood

Nuclear Science and Engineering

Volume 8 / Number 6 / December 1960 / Pages 615-620


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The thickness of reflectors required for critical configurations with spheres of U233 and Pu239 have been estimated from multiplication measurements of nearly critical assemblies. Reflector materials employed were uranium enriched in U235, normal uranium, beryllium, and tungsten alloy. Correction of the experimental data has been attempted to give “idealized” dimensions, i.e., a solid core in intimate contact with its reflector material.

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