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Portland cement concrete is an ideal material for use in construction of radiation shields. Although there are other materials that could be employed for radiation shielding purposes, concrete is not only economical, but it also has the advantage of being a material that can be cast into any desired homogeneous structural shape. Concrete is now commonly used for shielding of atomic research facilities, nuclear power plants, and for radiation medical and research units or equipment.
Professor of civil engineering, University of California, Berkeley, Calif.
Consulting engineer, United Nuclear Industries, Inc., Richland, Wash.