Correlating the fissile mass of standard uranium samples with delayed gamma rays from fission products
| Autor: | Douglas Chase Rodriguez, Hee-Jae Lee, Tohn Takahashi, Mitsuo Koizumi, Fabiana Rossi, Giovanni Varasano, Bent Pedersen, Tatjana Bogucarska |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Nuclear and High Energy Physics Fission products Fissile material 010308 nuclear & particles physics Nuclear engineering 0211 other engineering and technologies Gamma ray chemistry.chemical_element 02 engineering and technology Uranium 01 natural sciences Spectral line Joint research chemistry 0103 physical sciences Depleted uranium 021108 energy Spectroscopy Instrumentation |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 977:164306 |
| ISSN: | 0168-9002 |
| Popis: | The Japan Atomic Energy Agency and the European Commission Joint Research Centre are collaborating to develop delayed gamma-ray spectroscopy (DGS) for nuclear materials for safeguards verification in reprocessing plants. In this paper, we describe DGS interrogation using the Pulsed Neutron Interrogation Test Assembly with standard samples of different 235U enrichments. By analyzing gamma-ray spectra, we reveal a linear correlation between the sample mass and both the total counts above 3.3 MeV and the peak counts of specific high-energy gamma-ray. We were able to observe, qualify and quantify specific gamma rays peak down to the depleted uranium (0.5 g 235U) mass sample. Based on this, we demonstrate that our technique is able to estimate the total fissile mass with a statistical uncertainty 2% when taking into account self-shielding and gamma self-absorption corrections. Using integrated counts above 3.3 MeV we were able to reduce the mass-dependent bias for the higher enrichments ( ∼ 3 to 4%) to 4%. |
| Databáze: | OpenAIRE |
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