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Proceedings Paper

Investigations into the polymorphs and hydration products of UO3
Author(s): Lucas E. Sweet; Edgar C. Buck; Charles H. Henager; Shenyang Hu; David E. Meier; Shane M. Peper; Jon M. Schwantes; Yin-Fong Su; Robert L. Sams; Thomas A. Blake; Timothy J. Johnson; Thomas J. Kulp; Ricky L. Sommers; Joshua D. Sugar; Jeffrey D. Chames
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Paper Abstract

This work focuses on progress in gaining a better understanding of the polymorphic nature of the UO3 and UO3-water system; one of several important materials associated with the nuclear fuel cycle. The UO3-water system is complex and has not been fully characterized, even though these species are common throughout the fuel cycle. For example, most production schemes for UO3 result in a mixture of up to six different polymorphic phases, and small differences in these conditions will affect phase genesis that ultimately results in measureable changes to the end product. Here we summarize our efforts to better characterize the UO3-water system with optical techniques for the purpose of developing some predictive capability of estimating process history and utility, e.g. for polymorphic phases of unknown origin. Specifically, we have investigated three industrially relevant production pathways of UO3 and discovered a previously unknown low temperature route to β-UO3. Powder x-ray diffraction and optical spectroscopies were utilized in our characterization of the UO3-water system. Pure phases of UO3, its hydrolysis products and starting materials were used to establish optical spectroscopic signatures for these compounds. Preliminary aging studies were conducted on the α- and γ- phases of UO3.

Paper Details

Date Published: 9 May 2012
PDF: 7 pages
Proc. SPIE 8358, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII, 83581R (9 May 2012); doi: 10.1117/12.919706
Show Author Affiliations
Lucas E. Sweet, Pacific Northwest National Lab. (United States)
Edgar C. Buck, Pacific Northwest National Lab. (United States)
Charles H. Henager, Pacific Northwest National Lab. (United States)
Shenyang Hu, Pacific Northwest National Lab. (United States)
David E. Meier, Pacific Northwest National Lab. (United States)
Shane M. Peper, Pacific Northwest National Lab. (United States)
Jon M. Schwantes, Pacific Northwest National Lab. (United States)
Yin-Fong Su, Pacific Northwest National Lab. (United States)
Robert L. Sams, Pacific Northwest National Lab. (United States)
Thomas A. Blake, Pacific Northwest National Lab. (United States)
Timothy J. Johnson, Pacific Northwest National Lab. (United States)
Thomas J. Kulp, Sandia National Labs., California (United States)
Ricky L. Sommers, Sandia National Labs., California (United States)
Joshua D. Sugar, Sandia National Labs., California (United States)
Jeffrey D. Chames, Sandia National Labs., California (United States)


Published in SPIE Proceedings Vol. 8358:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII
Augustus Way Fountain, Editor(s)

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