含Gd环境友好型射线柔性综合屏蔽体研究

Research On Gd Environment Friendly Ray Flexible Comprehensive Shield

摘要:

针对核辐射 n-γ 混合场，研制了一种以 Gd 为核心屏蔽粒子， SEBS 为基体的环境友好型射线柔性综合屏蔽体，该材料具有绿色环保、生产节能、综合防护、柔性可塑、可回收使用等特点。扫描电镜结果表明 Gd2O3 粉末呈颗粒状均匀分布，在基体中有良好的分散性； X 射线衍射和红外光谱结果表明 Gd2O3 和基体本质上属于物理机械混合，不涉及化学键变化； γ 射线和热中子屏蔽性能验证表明，随着 Gd 面密度的提高， γ 射线和热中子透射率吸收遵从指数衰减规律；当 Gd 面密度为0.018 4 ~ 0.291 3 g/cm2时，材料在39 keV、59 keV和122 keV下 γ 射线透射率为83.73%~11.48%，75.43%~2.73%和93.03%~51.64%；当 Gd 面密度为0.018 9 ~ 0.070 9 g/cm2时，材料中子透射率为45.74%~35.78%。该柔性射线综合屏蔽体有效弥补了传统防护材料的弊端，在未来舰船生物屏蔽、核医学诊疗、安全检测等领域具有潜在应用价值。

Abstract:

For nuclear radiation n-γ mixed field, a kind of environment-friendly ray flexible synthetic shielding material is developed. The material uses Gd as the core shielding particle and SEBS as the matrix. It has the characteristics of environmental protection, production energy saving, comprehensive protection, flexible plastic, recyclable and so on. Scanning electron microscopy (SEM) shows Gd2O3 powder distributes uniformly in granular form and has excellent dispersion in the matrix. X ray diffraction spectroscopy (XRD) and fourier-transformed infrared spectroscopy (FT-IR) show that Gd2O3 and SEBS are essentially physico-mechanical mixtures, and do not involve changes of chemical bond. The shielding results of γ ray and thermal neutrons show that with the increase of Gd areal density, the transmittances of γ ray and thermal neutrons follow the exponential attenuation law. When the Gd areal density is 0.018 4 ~ 0.291 3 g/cm2, the γ ray transmittances of material at 39 keV, 59 keV and 122 keV are 11.48%~83.73%, 2.73%~75.43% and 51.64%~93.03%, respectively. When Gd areal density is 0.018 9 ~ 0.070 9 g/cm2, the neutron transmittance of material is 35.78%~45.74%. This flexible ray shielding material effectively makes up the disadvantages of traditional shielding materials. It has potential application values in the biological shielding in ships, nuclear medical diagnosis and treatment, radiographic testing and other fields.