Effect of heating on physical, mechanical, and nuclear radiation shielding properties of modified concrete mixes

• Published in: Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2018-12, Vol.153, p.104-110
• Main Authors: El-Samrah, Moamen G., Abdel-Rahman, Mohamed A.E., El Shazly, R.M.
• Format: Article
• Language: English
• Subjects: Attenuation coefficients; Barite; Californium isotopes; Collimation; Concrete; Dolomite; Effects; Fast neutrons; Gamma rays; Heating; Heating effect; Integrated fast neutrons removal macroscopic cross section; Limonite; Mixtures; Neutrons; Nuclear radiation; Radiation shielding; Stilbene; Total linear attenuation coefficient
• ISSN: 0969-806X; 1879-0895
• DOI: 10.1016/j.radphyschem.2018.09.018

Four concrete mixes, goethite-limonite concrete (G.L), barite-limonite concrete (B.L), steel slag-limonite concrete (S.L), and dolomite concrete (D.C) were prepared and designed to investigate the influence of heating (25, 100, 200, and 450 °C) on their performance as nuclear radiation shielding barriers. Slabs of different thicknesses from the investigated concrete mixes were exposed to a collimated beam of fast neutrons emitted from 252Cf like fission spectrum, with activity of 1.05 mCi. Measurements of the attenuation properties of fast neutrons as well as total, primary and secondary, gamma rays were performed. Organic scintillation detector with stilbene crystal was used to detect fast neutrons and total gamma-rays intensities. Results show that G.L concrete has the highest value of total removal macroscopic cross-section, Σ, for samples exposed to temperature up to 200 °C. However, for samples heated at 450 °C, G.L concrete has the poorest attenuation for fast neutrons. On the other hand, for total gamma rays, as temperature raising up to 450 °C, the B.L. concrete mix has the highest value of total linear attenuation coefficients (μ). Nevertheless; at 450 °C the S.L. concrete mix has almost the same value of μ as that of B.L. •Design four concrete mixes can be used as nuclear radiation shielding barriers.•The influence of heating was studied on the performance of concrete mixes.•The attenuation properties of fast neutrons &γ-rays were measured using 252Cf source.•Organic scintillation counter was used to detect a beam of fast neutrons & γ-rays.•G.L and B.L are recommended for inner part of biological shield for nuclear reactors.