Since a lot of medical facilities are made from normal weight concrete (NWC), it became an important task to improve the radiation shielding properties of such concrete in a confrontation to radiation with special emphasis on gamma radiation type. Therefore, an experimental program was conducted to investigate the effect of nanoparticles addition on gamma radiation shielding, physical properties, and mechanical properties of NWC. Nano silica (NS), nano hematite (NH), nano titania (NT), and their hybridization were added to NWC with four different percentages of 0.5, 0.75, 1.0, and 2.0% from the cement weight. A total of sixteen concrete mixes with nanoparticles in addition to a control mix were made. The long-term effects of gamma radiation on samples representing all concrete mixes were studied to find out the consequence of exposure to gamma rays over long periods (250 and 500 days) on their mechanical properties. The experimental results showed that the single addition of each of NS, NH, or NT particles and their combination up to 2.0% improved the physical properties, compressive strength, and attenuation coefficient of NWC. The results of the hybrid nano addition showed that the synergistic phenomenon occurred in some cases. Furthermore, the scanning electron microscopy technique (SEM) was used to prove the enhancement in the microstructure of NWC as a result of the addition of NS, NH, NT, and their combination.

由于许多医疗设施都是由普通重量混凝土（NWC）制成的，因此在面对辐射时，特别是伽马辐射类型的情况下，提高此类混凝土的辐射屏蔽性能已成为一项重要任务。因此，进行了一个实验程序来研究纳米粒子的添加对NWC的辐射屏蔽，物理性能和机械性能的影响。纳米二氧化硅（NS），纳米赤铁矿（NH），纳米二氧化钛（NT）及其杂化以水泥重量的四个不同百分比（分别为水泥重量的0.5％，0.75％，1.0％和2.0％）添加到NWC中。除了对照混合物之外，总共制备了十六种具有纳米颗粒的混凝土混合物。研究了γ射线对代表所有混凝土混合物的样品的长期影响，以找出长时间（250和500天）暴露于γ射线对其机械性能的影响。实验结果表明，单独添加NS，NH或NT颗粒及其含量高达2.0％可以改善NWC的物理性能，抗压强度和衰减系数。杂化纳米添加的结果表明在某些情况下发生了协同现象。此外，使用扫描电子显微镜技术（SEM）来证明由于添加了NS，NH，NT及其组合，NWC的微观结构得到了增强。实验结果表明，单独添加NS，NH或NT颗粒及其含量高达2.0％可以改善NWC的物理性能，抗压强度和衰减系数。杂化纳米添加的结果表明在某些情况下发生了协同现象。此外，使用扫描电子显微镜技术（SEM）来证明由于添加了NS，NH，NT及其组合，NWC的微观结构得到了增强。实验结果表明，单独添加NS，NH或NT颗粒及其含量高达2.0％可以改善NWC的物理性能，抗压强度和衰减系数。杂化纳米添加的结果表明在某些情况下发生了协同现象。此外，使用扫描电子显微镜技术（SEM）来证明由于添加了NS，NH，NT及其组合，NWC的微观结构得到了增强。