Optical vibrational spectroscopic signatures related to U3O8 production processes

Roach, Jordan M.; Miskowiec, Andrew; McDonald, Luther; Abbott, Erik C.; Nizinski, Cody A.; Schwerdt, Ian J.; Spano, Tyler L.

doi:10.1016/j.jnucmat.2024.155522

Title: Optical vibrational spectroscopic signatures related to U₃O₈ production processes

Journal Article · 14 November 2024 · Journal of Nuclear Materials

DOI: https://doi.org/10.1016/j.jnucmat.2024.155522 · OSTI ID:2480046

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^[2]; Abbott, Erik C. ^[3];

^[4]; Schwerdt, Ian J. ^[5];

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
University of Utah, Salt Lake City, UT (United States)
University of Utah, Salt Lake City, UT (United States); Y-12 National Security Complex, Oak Ridge, TN (United States)
University of Utah, Salt Lake City, UT (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
University of Utah, Salt Lake City, UT (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Uranium ore concentrates are materials found early within the nuclear fuel cycle and contain high concentrations of uranium in an easily transported form, making the concentrates a likely target for illegal diversion. These concentrates are typically converted to U₃O₈ for further processing and, therefore, may lose specific physicochemical characteristics in determining the materials’ source and processing history. In this work, we explore the Raman spectra of eight oxide samples produced from various uranium ore concentrates and processing pathways to examine the presence of spectroscopic signatures relating to each sample's process history. Samples produced from amine extraction and dialkylphosphoric acid extraction processes show unique characteristics due to high concentrations of α-UO₃, whereas samples calcinated from metallic diuranates do not form pure α-U₃O₈ because of metallic ion inclusions. Pure α-U₃O₈ oxide samples are obtained through calcination of ammonium diuranate, ammonium uranyl carbonate, and metastudtite intermediates. The Raman spectra of these oxide samples show close agreement with pristine α-U₃O₈ spectra. However, deviations from the pristine spectra are observed in the 300–460 cm^-1 spectral range. In conclusion, these deviations are unique identifying signatures that were likely created by lasting effects from the process history. Spectral center of mass calculations indicate grouping of samples based on processing history.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2480046

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 604; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Optical vibrational spectroscopic signatures related to U₃O₈ production processes