Passive Non-Destructive Assay based on gamma-ray spectrometry to verify UO2 samples in the form of powder and pellet
| Autor: | S. M. El-Minyawi, Elham H. El-hakim, M. N. H. Comsan, Sayed A. El-Mongy, M. Tohamy, M. Fayez-Hassan, S. Abd El-Ghany |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Spectrometer Astrophysics::High Energy Astrophysical Phenomena Uranium dioxide Pellets Analytical chemistry chemistry.chemical_element 02 engineering and technology Nuclear material Uranium Natural uranium 021001 nanoscience & nanotechnology Enriched uranium 01 natural sciences chemistry.chemical_compound Nuclear Energy and Engineering chemistry 0103 physical sciences 0210 nano-technology Line (formation) |
| Zdroj: | Annals of Nuclear Energy. 87:186-191 |
| ISSN: | 0306-4549 |
| Popis: | Passive Non-Destructive Assay (PNDA) gamma-spectroscopic method is employed for nuclear material verification. The investigated materials are natural (NU) and low enriched uranium (LEU) in the form of uranium dioxide (UO 2 ) pellets and powder, respectively. A high-resolution gamma-ray spectrometer based on HPGe detector and associated electronics is used for the measurement. The spectrometer efficiency was measured experimentally using the intrinsic self-calibration method taking into account the necessary correction factors. Sample isotopic fractions were obtained using two methods; that based on the measurement of the count rate of 185.7 keV gamma line of 235 U and 1001 keV gamma line of 234m Pa ( 238 U) employing the intrinsic self-calibration technique to calculate the activity ratio of 235 U/ 238 U. The other method is based on uranium activity ratio measurements without efficiency corrections by choosing two gamma-rays close enough in energy, one related to 235 U (84.2 keV gamma line of 231 Th) and the other to 238 U (63.3 keV gamma line of 234 Th). Samples were characterized by calculating uranium isotopic mass, uranium isotopic activity ratio, total uranium content and enrichment. Special attention was given at calculating absolute error of the measured quantities, as well as the statistical behavior of the measured data in terms of the well known statistical quantities. The experimental results showed good agreement with calculated data. |
| Databáze: | OpenAIRE |
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