Radiation is an important phenomenon as it is used in a variety of different fields. However, its possible hazardous effect should be taken into account and it should be shielded. As the concrete is a widely used construction material, the mechanical and radiation shielding properties of concretes containing boron-bearing aggregate additives have been studied. The results show that the addition of colemanite or ulexite into concrete has significant effects on density, workability, compressive and flexural strength, elastic modulus and radiation shielding. The results also show that concrete containing colemanite or ulexite is no more effective in the attenuation of gamma rays than ordinary concrete.