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Presentation and Modeling of a New Nanocomposite Shield Against Gamma Radiation Based on Simulation and Computational Tools

Arvaneh, Ali | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55543 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Hosseini, Abolfazl
  7. Abstract:
  8. In this study, using the MCNPX computer code based on the Monte Carlo method, the properties of protection against gamma-rays of the glass system with the combination of (55-x)Bi2O3-15Pb3O4-20Al2O3-10ZnO-xTiO2 with certain concentrations (x= 0, 5, 10, 15, 20, 25, 30 and 35 mol percent) and in nano and micro dimensions by calculating several parameters related to photon attenuation such as half value layer (HVL), Tenth value layer (TVL), mean free range (MFP), mass attenuation coefficient (m), linear attenuation coefficient (l), effective atomic number (Zeff) and buildup factor (BF) for We investigated different energy levels in the range of 1500-100 keV. To verify the simulation results, the data obtained from the simulation (value of m) was compared with the experimental data available in the XCOM database. The NIST-XCOM database and the MCNPX computer code were in good agreement. The percentage of deviation (PD) between the XCOM database and the results of the simulation with the MCNPX computer code was less than 0.59%, except for 500 keV energy. The results show that compared to conventional protective materials such as concrete and lead, the new combination shows more effective attenuation parameters. The nanocomposite with the highest concentration of TiO2 has the most favorable state in terms of density compared to the investigated protective materials. The close agreement between the XCOM database measurements and the simulations of this study shows that Monte Carlo modeling is a valuable and valid method in this research.

  9. Keywords:
  10. Gamma Rays ; Monte Carlo N-Particle (MCNP)Code ; Attenuation Parameters Shielding Materials ; Buildup Factor ; XCOM Database

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