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Fabrication of “Boron-Clay-Polymer" and "Lead-Clay-Polymer" Nanocomposites for Radiation Shielding of Neutron and Gamma Rays

Kiani, Mohammad Amin | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45482 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Outokesh, Mohammad; Ahmadi, Javad; Mohammadi, Agheil
  7. Abstract:
  8. In this study, epoxy resin has been modified by nano-clay additives using direct mixing method and epoxy-clay nanocomposites were designed and produced with optimized percentage of clay content. By adding the powder of born carbide and lead oxide in nanocomposites new compounds are obtained. The results are used for protection against neutron and gamma rays, respectively. After preparation of epoxy-clay-born carbide and epoxy- clay-lead oxide nanocomposite the effects of irradiation and carbon fiber on mechanical and thermal properties of nanocomposites were examined. The Nanocomposites were exposed to Electron Beam Irradiation (EBI) in 100 and 500 kGy doses to investigate the effect of irradiation. To study the morphology of nanocomposites scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD) has been used. The tensile tests for evaluated mechanical properties and thermogravimetric analysis (TGA) for characterized thermal stability of nanocomposites were conducted. Irradiated of nanocomposites not only did not damage or reduce tensile strength but also improved the tensile strength and modulus at all doses of EBI. Moreover using carbon fiber also increased the tensile strength more than 1,000 percent in all samples. TGA results confirm the behavior observed in mechanical tests. In other word the first and second maximum degradation temperature of all nanocomposites that whether used carbon fiber or were exposed EBI, increased compared to samples which did not use Carbon Fiber or exposed EBI. After the investigation of thermal and mechanical properties of nanocomposites, neutron and gamma attenuation rate experiment that were the ultimate goal of this project were done. This results indicates that the nanocomposite shields have high performance .So that the neutron shield with thickness of 6 mm could absorb 82% of thermal neutrons, furthermore the half value layer (HVL) of gamma shield against IR-192 gamma source 1.8 cm was obtained
  9. Keywords:
  10. Mechanical Properties ; Thermal Stability ; Electron Beam Irradiation ; Polymer Layered Silicate Nanocomposite (PLSNs) ; Neutron Shielding ; Gamma Shielding

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