Thomas C. Shehee
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View article: How novel is protactinium: Insights into the structure and properties of (PaO) <sub>2</sub> (SO <sub>4</sub> ) <sub>3</sub> (H <sub>2</sub> O) <sub>2</sub>
How novel is protactinium: Insights into the structure and properties of (PaO) <sub>2</sub> (SO <sub>4</sub> ) <sub>3</sub> (H <sub>2</sub> O) <sub>2</sub> Open
Because of the scarcity of protactinium and the challenges associated with its separation and crystallization, even in sulfuric acid media where protactinium is relatively stable, there has been an incomplete understanding of the structura…
View article: Characterization of PuO<sub>2</sub> With Visible and UV Raman Spectroscopy: Discrimination Between the Bulk, Surface, and an Intermediate Disordered Layer
Characterization of PuO<sub>2</sub> With Visible and UV Raman Spectroscopy: Discrimination Between the Bulk, Surface, and an Intermediate Disordered Layer Open
Raman spectroscopy is an ideal tool in the characterization of materials including PuO 2 . The wavelength‐dependent absorptivity of the material defines the light penetration depth and the relative Raman scattering contribution from the bu…
View article: Development of spectroscopic tools for nuclear forensics signatures development
Development of spectroscopic tools for nuclear forensics signatures development Open
The Savannah River National Laboratory (SRNL) has been developing advanced spectroscopic tools for the characterization of plutonium-bearing compounds with the intent to develop material and process signatures for nuclear forensics. Pluton…
View article: Laser-Induced Plasmas of Plutonium Dioxide in a Double-Walled Cell
Laser-Induced Plasmas of Plutonium Dioxide in a Double-Walled Cell Open
Plutonium research has been stifled by the significant number of administrative controls and safety procedures, space and instrumentation limitations in radiological gloveboxes, and the potential for personnel and equipment contamination. …
View article: Analysis of H-Canyon Process Tanks in Preparation of Consolidation and Blending for HALEU Fuels
Analysis of H-Canyon Process Tanks in Preparation of Consolidation and Blending for HALEU Fuels Open
High-Assay Low- Enriched Uranium (HALEU) fuels are being developed to support the replacement of Highly Enriched Uranium (HEU) fuels used in U.S. High-Performance Research Reactors (USHPRR) as well as advanced nuclear power reactor designs…
View article: Impact of Precipitation Parameters on the Specific Surface Area of PuO<sub>2</sub>
Impact of Precipitation Parameters on the Specific Surface Area of PuO<sub>2</sub> Open
Controlling the properties of PuO2 through processing is of vital importance to environmental transport and fate, production of nuclear fuels, nuclear forensic analyses, stockpile stewardship, and storage of nuclear wastes applications. A …
View article: Fundamental <sup>235</sup>Uranium Nuclear Resonance Spectroscopy (End of Year Report)
Fundamental <sup>235</sup>Uranium Nuclear Resonance Spectroscopy (End of Year Report) Open
Uranium-235 is ubiquitous in the nuclear industry however, detailed characterization by magnetic resonance spectroscopy has remained largely elusive to-date. Conventional nuclear magnetic resonance techniques are ill-suited for characteriz…
View article: Forward of special issues on separations for energy applications
Forward of special issues on separations for energy applications Open
Following a tradition of 40 years, since 1979, these two special issues focus on separation science and technology (SS&T) for energy applications. Within this work are papers that have been presented at the 20th Symposium on Separation Sci…
View article: Screening of Gel Formation Methods in Paraffin Based Systems
Screening of Gel Formation Methods in Paraffin Based Systems Open
The Savannah River National Laboratory (SRNL) has evaluated gel formation in kerosene using a lecithin-based system, the aluminum soap of naphthenic and palmitic acid or derivatives, and an acrylamide copolymerization. Some gelling was obs…
View article: Raman spectroscopy: A tool to investigate alpha decay damage in a PuO<sub>2</sub> crystal lattice and determining sample age since calcination
Raman spectroscopy: A tool to investigate alpha decay damage in a PuO<sub>2</sub> crystal lattice and determining sample age since calcination Open
Raman microspectroscopy can be used to measure local physical properties of materials, such as the lattice parameter. Alpha decay induced lattice damage of plutonium dioxide (PuO 2 ) results in the growth of new bands and broadening of the…
View article: Dissolution of used nuclear fuel using a tributyl phosphate/n-paraffin solvent
Dissolution of used nuclear fuel using a tributyl phosphate/n-paraffin solvent Open
The complete recycle of used nuclear fuel (UNF) is necessary to recover the energy value from the remaining U and higher actinides; yet, construction of a large-scale facility is extremely expensive. To address this issue, a hybrid process…
View article: Dissolution of Used Nuclear Fuel using a TBP/n-paraffin Solvent
Dissolution of Used Nuclear Fuel using a TBP/n-paraffin Solvent Open
The complete recycle of used nuclear fuel (UNF) is desirable to recover the energy value from the remaining U and the higher actinides produced during fuel irradiation; however, the construction of a large-scale reprocessing facility is pr…
View article: High-Capacity Poly(4-vinylpyridine) Grafted PolyHIPE Foams for Efficient Plutonium Separation and Purification
High-Capacity Poly(4-vinylpyridine) Grafted PolyHIPE Foams for Efficient Plutonium Separation and Purification Open
The use of anion-exchange resins to separate and purify plutonium from various sources represents a major bottleneck in the throughput that can be achieved when this step is part of a larger separation scheme. Slow sorption kinetics and br…
View article: Dissolution of Used Nuclear Fuel Using a TBP/N-Paraffin Solvent
Dissolution of Used Nuclear Fuel Using a TBP/N-Paraffin Solvent Open
The dissolution of unirradiated used nuclear fuel (UNF) pellets pretreated for tritium removal was demonstrated using a tributly phosphate (TBP) solvent. Dissolution of pretreated fuel in TBP could potentially combine dissolution with two …
View article: Determination of the impact of glycolate on ARP and MCU operations
Determination of the impact of glycolate on ARP and MCU operations Open
Savannah River Remediation (SRR) is evaluating an alternate flowsheet for the Defense Waste Processing Facility (DWPF) using glycolic acid as a reductant. An important aspect of the development of the glycolic acid flowsheet is determining…