Abstract
In this article, concrete specimens of different mixtures of cement–barite–bismuth were investigated as gamma-rays shield. For this purpose, a series of 60 concrete specimens were manufactured and their shielding properties were studied. Gamma-rays emitted from gamma sources of 137Cs were passed through concrete specimens and detected by three inches NaI (Tl) detector. Then, the linear attenuation coefficients, the half-value layer thicknesses and the compressive strengths of the concrete specimens were experimentally determined. A comparison of concrete specimens with and without barite aggregate and bismuth powder revealed that the concrete specimen containing 100% barite aggregate and 15% bismuth powder has the highest value of the linear attenuation coefficient. The results also indicated that the maximum value of the compressive strength is 382.01 kg/cm2 for the concrete specimen with 50% barite aggregate and 10% bismuth powder. High-performance concrete including barite aggregate and bismuth powder increased shielding properties of concrete against gamma-rays.
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