Recommendation for data on shielding from ionizing radiation. Shielding from gamma radiation|Cobalt, Radiation hazards, Lead, Shields, Thickness, Radioactivity, Mathematical calculations, Radioactive materials, Protective barriers, Radiation protection, Gold, Uranium, Antimony, Safety devices, Radiation shields, Iron, Water, Radioactive isotopes, Diffusion (waves), Radium, Minerals, Concretes, Tantalum, Gamma-radiation, Transmittance, Sodium, Steels, Iridium, Absorption (waves), Krypton, Bricks, Nuclear safety, Radiation, Aluminium, Lanthanides, Ionizing radiation, Caesium, Thorium