El-Sarraf M A, El-Sayed Abdo A
Nuclear and Radiological Regulatory Authority, 3 Ahmed El-Zomor Street, P.O. Box 7551, Nasr City 11762, Cairo, Egypt.
Appl Radiat Isot. 2013 Sep;79:18-24. doi: 10.1016/j.apradiso.2013.04.026. Epub 2013 May 4.
A trial has been made to create insulating Epoxy/Barite (EP/Brt) (ρ=2.85 g cm(-3)) and Crosslinked Unsaturated Polyester/Barite (CUP/Brt) (ρ=3.25 g cm(-3)) composites with radiation attenuation and shielding capabilities. Experimental work regarding mechanical and physical properties was performed to study the composites integrity for practical applications. The properties were found to be reasonable. Radiation attenuation properties have been carried out using emitted collimated beam from a fission (252)Cf (100 µg) neutron source, and the neutron-gamma spectrometer with stilbene scintillator. The pulse shape discriminating (P.S.D) technique based on the zero cross-over method was used to discriminate between neutron and gamma-ray pulses. Thermal neutron fluxes, measured using the BF3 detector and thermal neutron detection system, were used to plot the attenuation relations. The fast neutron macroscopic effective removal cross-section ΣR, gamma ray total attenuation coefficient µ and thermal neutron macroscopic cross-section Σ have been evaluated. Theoretical calculations have been achieved using MCNP-4C2 code to calculate ΣR, µ and Σ. Also, MERCSF-N program was used to calculate macroscopic effective removal cross-section ΣR. Measured and calculated results have been compared and were found to be in reasonable agreement.
已尝试制备具有辐射衰减和屏蔽能力的绝缘环氧树脂/重晶石（EP/Brt）（ρ = 2.85 g cm⁻³）和交联不饱和聚酯/重晶石（CUP/Brt）（ρ = 3.25 g cm⁻³）复合材料。进行了有关机械和物理性能的实验工作，以研究复合材料在实际应用中的完整性。发现这些性能是合理的。使用来自裂变（²⁵²）Cf（100 µg）中子源的发射准直束以及带有芪闪烁体的中子 - γ 光谱仪进行了辐射衰减性能测试。基于零交叉法的脉冲形状鉴别（P.S.D）技术用于区分中子和γ射线脉冲。使用BF3探测器和热中子探测系统测量的热中子通量用于绘制衰减关系。已评估了快中子宏观有效去除截面ΣR、γ射线总衰减系数µ和热中子宏观截面Σ。使用MCNP - 4C2代码进行了理论计算，以计算ΣR、µ和Σ。此外，使用MERCSF - N程序计算宏观有效去除截面ΣR。已对测量结果和计算结果进行了比较，发现两者吻合良好。
