Building blocks for building shielding walls against radioactive radiation

Abstract From the Canadian patent

A building block useful in plurality, especially, for erecting shielding walls in nuclear facilities is made, of a cube-shaped metal jacket consisting of steel plate especially special steel, which jacket is closed on all sides and is filled with concrete. To facilitate handling and to permit the erection of shielding walls with building blocks in fixed positions, the top surfaces and the bottom surfaces of the jacket are provided with bulging formations in the form of projections and depressions which engage with each other between adjacent building blocks to mutually fix the positions of the building blocks.