Research On The Preparations And Shielding Effects Of Epoxy Resin-based Nano Radiation Protection Materials

Polymer radiation protective materials are becoming popular nowadays because of their lowdensity, easy molding, low cost and high radiation attenuation coefficient. We mainly studied thepreparation and shielding property of nano epoxy resin based radiation protective materials and themass attenuation coefficients. The results we obtained were summarized as follow:（1） To verify the influence of the functional elements particular size for the radiation attenuationcoefficients and mechanical properties radiation shielding material based on epoxy resin, we haveprepared two WO₃/E44samples with different particular size of WO₃by a solidified formingapproach. The linear attenuation coefficients of these samples have been measured for γ-ray photoenergies of59.6,121.8, and344.1keV etc. using narrow beam transmission geometry. It was foundthat the linear attenuation coefficients would increase with decreasing of the particle size of the WO₃in the epoxy resin based radiation shielding material. The theory values of the linear attenuationcoefficients and mass attenuation were calculated using WinXcom, and good agreements have beenobserved between experimental and theoretical values. From the studies of the obtained results it isreported here that from the shielding point of view the nano-WO₃is more effective than micro-WO₃inepoxy resin based radiation shielding material.（2） To verify the influence of functional elements with different K absorption edge for theradiation attenuation coefficient of radiation shielding material based on epoxy resin. We haveprepared seven samples in different proportions of WO₃and CeO₂by a solidified forming approach.Narrow beam transmission geometry was used to measure the linear attenuation coefficients of thesesamples. It was found that with the increasing content of CeO₂, the material’s ability to attenuate lowenergy of γ-rays has been proved. On the other hand, the higher content of WO₃in samples, thegreater ability to attenuate the high energy of γ-rays. The theory values of these samples’ linearattenuation and mass attenuation coefficients were calculated by WinXcom, and agreements has beenobserved between experimental and theoretical values.（3） WO₃/CeO₂/epoxy resin based multilayer radiation shielding material was prepared forradiation protection via route of surface treatment on WO₃and CeO₂. The microstructure of multilayermaterial was studied by scanning electron microscope （SEM）. Radiation shielding property wascalculated by gamma energy spectrum system and Gamma vision software. EGSnrc was used tocalculate the linear attenuation coefficient of multilayer material and compared with the experimentalresults. We also investigated the effect of the sequence of WO₃and CeO₂to the shielding capability ofmultilayer material. The result indicated that the particles of WO₃and CeO₂in the material weprepared were homogeneous but with slight reunion phenomenon. The linear attenuation coefficient calculated by experimental result was basically conforming to the data of simulation. In the area oflow energy, the radiation attenuation coefficient of multilayer material was greater which CeO₂was inthe front. On the other hand, in the area of high energy, the radiation attenuation coefficient ofmultilayer material was greater which WO₃was in the front.