Environment-Friendly Flexible Radiation Shielding Materials Incorporated with Gd
For nuclear radiation n-γ mixed field,a kind of environment-friendly ray flexible synthetic shielding material was developed using Gd as the core shielding element and SEBS as the matrix.It has the characteristics of environmental protection,production energy saving,comprehensive protection,flexible plastic,recyclable,etc.SEM result shows that Gd2O3 powder distributes uniformly in granular form and has excellent dispersion in the matrix.X ray diffraction(XRD)and Fourier-transformed infrared(FT-IR)results show that Gd2O3 and SEBS are essentially physico-mechanical mixtures,and do not involve changes in chemical bond.The shielding results of γ ray and thermal neutrons show that with the increase of Gd areal density,the transmittances in γ ray and thermal neutrons follow the exponential attenuation law.When the Gd areal density is 0.0184-0.2913 g/cm2,the γ ray transmittances of material at 39,59 and 122 keV are 83.73%-11.48%,75.43%-2.73%and 93.03%-51.64%,respectively.When Gd areal density is 0.0189-0.0709 g/cm2,the neutron transmittance of material is 45.74%-35.78%.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.