Recommendation for data on shielding from ionizing radiation. Shielding from X-radiation|Shields, Radiation, Aluminium, Steels, Lead, Diffusion (waves), Ionizing radiation, Radiation hazards, Transmittance, Bricks, Bremsstrahlung, Safety devices, Absorption (waves), Polymethyl methacrylate, Protective barriers, Wood, Glass, Low-carbon steels, Design, Radiation protection, Mathematical calculations, Radiation shields, Thickness, X-rays, Sheet glass, Electromagnetic radiation, Plasters, Brass, Nuclear reactions, Concretes