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Discrimination of Neutron and Gamma Spectrum Using a Method Based on Digital Filters

Valipour, Mahdi | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55532 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Hosseini, Abolfazl
  7. Abstract:
  8. Since the beginning of discussion on neutron-gamma discrimination, different methods were suggested for this purpose. In early 2000s, Analogue methods were mainly used to discriminate the spectrum in mixed fields which mostly depends on electronic modules used in the lab setup; Nowadays, with improvements in digital pulse processing techniques, analyzing mixed neutron-gamma fields for pulse discrimination is also available.In this research, the recent MC developed toolkit called GEANT4 is used to simulate the 3-inch BC501A scintillation detector and 500 mCi Am-Be source (that emits neutron and gamma at the same time). For the next step, an experiment with same source and detector was done to be able to compare these results with the records taken after applying the digital filters on the GEANT4 simulation outputs. To achieve this goal, first the analogue constant fraction method was considered to be done in lab; Then, the source and detector discussed above with same distance used in analogue method was simulated in GEANT4 toolkit to get the simulation results for further analysis. After that, three different digital filters called Triangular, Trapezoidal and Flat Top Cusp were applied on simulation output data to find the optimum values for each effective parameters in these filters; The reason to choose these specific filters was that these ones will have the best results in this spectrum discrimination [7].After the comparison of analogue results with discrimination made by using digital filters on simulation output, It was found out that in triangular filter, the only effective parameter is named as “k” while in trapezoidal and flat top cusp filters the effective parameters are considered as “k” and “L”; Based on the comparison results, for k=11 in triangular filter, k=10 and L=5 in trapezoidal and k=10 and L=20 in flat top cusp filter we could get the best results.
  9. Keywords:
  10. Digital Filters ; GEANT4 Toolkit ; Neutron-Gamma Discrimination ; Neutron Spectra ; Gamma Ray Spectrum ; NE213 Detector ; Am-Be Source ; Radiation Sources

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