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Simulation and Optimization of Neutron Activation Analysis Using the K0- IAEA Software and Comparison with the Experimental Results

Sattari Heris, Aghil | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49458 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Vossoughi, Naser; Hosseini, Abolfazl
  7. Abstract:
  8. Neutron activation is a nuclear method for determination of elements in each sample. In this method, the samples are exposed to neutron irradiation by neutrons which are usually produced by research reactor, and then the core becomes unstable due to capturing the neutron and emits gamma rays. The emitted gamma rays can be detected by a detector like a HPGe semiconductor which has a high resolution. All nucleuses have a probability of neutron absorption, expressed by the absorption cross section area. The radioactive nuclei value depends on the nuclear half-life and the number of unstable nuclei. The only Windows environment commercial software for neutron activation analysis was K0 for years. However, the software K0-IAEA has been developed and introduced by International Atomic Energy Agency (IAEA) in 2005 for neutron activation analysis (NAA). Important parameters in neutron activation analysis can be designed and simulated optimally by using the software. K0-IAEA software provides comprehensive view of more trusted result investigation with minimum user interruption according to its internal modification. The software always considers self-shielding effect for the gamma rays in the samples, calibration sources and cylinder samples. It is corrected and controlled according to data matrix composition, sample dimensions and sources, so the analysis results are more precise and reliable. Trace elements found in the standard sample SOIL-7 1635, were matched and compared with the approved amounts through the software K0-IAEA and the error is 10% except for elements of Na, Sc, Ta, U, Eu, Tb, Dy and Lu. Bias parameter or relative error for all elements is between zero to 10% indicating accuracy and precision of the results. Parameter U-score for all elements is less than one so that indicates that resulting values for all standard sample elements of the SOIL-7 1635 at a confidence level 95
  9. Keywords:
  10. Simulation ; Neutron Activation Analysis ; Optimization ; KO International Atomic Energy Agency (IAEA)Code ; Neutron Flux ; Spectrum Analyzer ; U-Score Test

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