On the Shielding Qualities of Different Concrete Mixtures

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Abstract
Absorption curves for neutrons and γ‐radiation produced by 16‐Mev protons on beryllium are measured in absorber blocks of various concrete mixtures to obtain information on their shielding properties. It is shown that a mixture of cement, scrap iron, and limonite ore is as efficient as water in slowing down and capturing neutrons and, in addition, has sufficient density (ρ=3.5 g/cm3) to be an effective absorber for γ‐radiation. Compared to ordinary concrete, a three‐foot wall of iron and limonite concrete is superior by a factor of 280 for neutrons and by a factor of 20 for γ‐radiation. Boron is shown to be of little value in this type of shielding. Mechanical properties of the scrap iron‐limonite concrete are satisfactory for structural purposes. From the practical cost standpoint, a concrete made entirely of limonite ore is shown to be a reasonable compromise.