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Design of Neutron Radiography System Based on the Time of Flight Method Using GEANT4 Software

Vahidian, Mohamad | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54530 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Hosseini, Abolfazl; Mehrabi, Mohammad
  7. Abstract:
  8. Neutron Radiography is one of the non-destructive testing methods of materials and due to its special application compared to gamma or X-ray imaging, it is highly regarded and developed in the world. A special application of neutron imaging is the imaging of materials with a low atomic number, even when coated with a material with a high atomic number. Neutron Radiography has different methods for capturing and recording images by neutrons. Among these methods, the following 7 methods can be mentioned: Neutron radiography (film), Track Etch, Digital neutron imaging, Neutron camera (DR System), Image plates (CR System), Flat panel silicon detectors (DR system) and Micro channel plates (DR system). In order to perform neutron Radiography, a method must be found to detect it. For this purpose, neutron detection methods are classified into two categories: direct and indirect. The indirect neutron detection method uses the detection of an emitted charged particle or a repelled proton. In the direct neutron detection method, two methods of crystal diffraction or neutron time of flight can be used. The neutron time of flight method is performed in two ways: direct and scattered neutrons. One of the advantages of this method in neutron radiography is that it does not require high processing power for imaging (high speed) as well as high energy resolution. In this study, the aim is to seperate the neutron and gamma spectra using the neutron time of flight method in neutron radiography to improve the image. Also, using the optimal selection of the type and dimensions of the detector and the appropriate source, the sensitivity of image quality to various neutron radiographic parameters will be analyzed and with using the Geant4 Monte Carlo code, the proposed design will be simulated
  9. Keywords:
  10. Time of Flight ; Monte Carlo Model ; Simulation ; Neutron Radiography ; Geant4 Application for Tomographic (GATE)Emission

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