دورية أكاديمية
Oxygen Isotope and Fluorine Impurity Signatures during the Conversion of Uranium Ore Concentrates to Nuclear Fuel
| العنوان: | Oxygen Isotope and Fluorine Impurity Signatures during the Conversion of Uranium Ore Concentrates to Nuclear Fuel |
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| المؤلفون: | Aaron M. Chalifoux, Cody Nizinski, Miguel Cisneros, Travis Tenner, Benjamin Naes, Kimberly N. Wurth, Erik Oerter, Michael Singleton, Gabriel J. Bowen, Luther W. McDonald |
| سنة النشر: | 2024 |
| مصطلحات موضوعية: | Cell Biology, Physiology, Ecology, Space Science, Environmental Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, products remained similar, processed via precipitation, minimally utilized due, findings show promise, two water sources, single water source, combining multiple signatures, 2 ,, either directly reduced, nuclear fuel within, nuclear fuel cycle, 4 , 3 , 2 , f impurity abundances, sims isotope mapping, fluorine impurity signatures, uranium ore concentrates, analyzed using fluorination, >, 18 , low f impurities, oxygen isotope compositions, reduced without steam |
| الوصف: | Within the front end of the nuclear fuel cycle, many processes impart forensic signatures. Oxygen-stable isotopes (δ 18 O values) of uranium-bearing materials have been theorized to provide the processing and geolocational signatures of interdicted materials. However, this signature has been minimally utilized due to a limited understanding of how oxygen isotopes are influenced during uranium processing. This study explores oxygen isotope exchange and fractionation between magnesium diuranate (MDU), ammonium diuranate (ADU), and uranyl fluoride (UO 2 F 2 ) with steam (water vapor) during their reduction to UO x . The MDU was precipitated from two water sources, one enriched and one depleted in 18 O. The UO 2 F 2 was precipitated from a single water source and either directly reduced or converted to ADU prior to reduction. All MDU, ADU, and UO 2 F 2 were reduced to UO x in a 10% hydrogen/90% nitrogen atmosphere that was dry or included steam. Powder X-ray diffraction (p-XRD) was used to verify the composition of materials after reduction as mixtures of primarily U 3 O 8 , U 4 O 9 , and UO 2 with trace magnesium and fluorine phases in UO x from MDU and UO 2 F 2 , respectively. The bulk oxygen isotope composition of UO x from MDU was analyzed using fluorination to remove the lattice-bound oxygen, and then O 2 was subsequently analyzed with isotope ratio mass spectrometry (IRMS). The oxygen isotope compositions of the ADU, UO 2 F 2, and the resulting UO x were analyzed by large geometry secondary ion mass spectrometry (LG-SIMS). When reduced with steam, the MDU, ADU, and UO 2 F 2 experienced significant oxygen isotope exchange, and the resulting δ 18 O values of UO x approached the values of the steam. When reduced without steam, the δ 18 O values of converted ADU, U 3 O 8 , and UO x products remained similar to those of the UO 2 F 2 starting material. LG-SIMS isotope mapping of F impurity abundances and distributions showed that direct steam-assisted reduction from UO 2 F 2 significantly removed F impurities while ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| العلاقة: | https://figshare.com/articles/journal_contribution/Oxygen_Isotope_and_Fluorine_Impurity_Signatures_during_the_Conversion_of_Uranium_Ore_Concentrates_to_Nuclear_Fuel/25298018Test |
| DOI: | 10.1021/acsomega.3c10481.s001 |
| الإتاحة: | https://doi.org/10.1021/acsomega.3c10481.s001Test https://figshare.com/articles/journal_contribution/Oxygen_Isotope_and_Fluorine_Impurity_Signatures_during_the_Conversion_of_Uranium_Ore_Concentrates_to_Nuclear_Fuel/25298018Test |
| حقوق: | CC BY-NC 4.0 |
| رقم الانضمام: | edsbas.4851DCA6 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1021/acsomega.3c10481.s001 |
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