Neutron Shielding Properties of a New High-Density Concrete

The neutron shielding properties of a new high-density concrete developed in Spain have been characterized experimentally. The shielding properties of this concrete against photons were previously studied and the material is being used to build bunkers, mazes and doors in medical accelerator facilities with good overall results. In this work, the objective was to characterize the material behaviour against neutron, as well as to test alternative mixings including boron compounds in an effort to improve neutron shielding efficiency. With this purpose, different thickness were exposed to an Am-Be neutron source under controlled conditions in the neutron measurements laboratory. The original mix, which includes a high fraction of magnetite, was then modified by adding different proportions of anhydrous borax. In order to have a reference against common concrete used to shielding medical accelerator facilities, then same experiment was repeated with ordinary concrete slabs.

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