Forrest D. Heller
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View article: Investigation of the thermal decomposition of Pu(IV) oxalate: a transmission electron microscopy study
Investigation of the thermal decomposition of Pu(IV) oxalate: a transmission electron microscopy study Open
The degradation of the internal structure of plutonium (IV) oxalate during calcination was investigated with Transmission Electron Microscopy (TEM), electron diffraction, Electron Energy-Loss Spectroscopy (EELS), and 4D Scanning TEM (STEM)…
View article: Chemical and spectroscopic characterization of plutonium tetrafluoride
Chemical and spectroscopic characterization of plutonium tetrafluoride Open
Fundamental vibrational and electronic properties of plutonium tetrafluoride are explored with multiple techniques such as infrared, diffuse reflectance and Raman.
View article: Extraction of Nitric Acid and Uranium with DEHiBA under High Loading Conditions
Extraction of Nitric Acid and Uranium with DEHiBA under High Loading Conditions Open
The mechanism by which high concentrations (1.5 M in n-dodecane) of N,N-di-2-ethylhexyl-isobutyramide (DEHiBA) extracts HNO3 and UO2(NO3)2 is under examination. Most prior studies have examined the extractant and the mechanism at a concent…
View article: Casting and Characterization of U-50Zr
Casting and Characterization of U-50Zr Open
Uranium alloyed with 50 wt% zirconium (U-50Zr) is a proposed light water reactor (LWR) nuclear fuel by Lightbridge Corporation (LTBR). The proposed method for making the U-50Zr alloy is to arc-melt master alloys and then remelt in a vacuum…
View article: Investigation of process history and phenomenology of plutonium oxides using vector quantizing variational autoencoder
Investigation of process history and phenomenology of plutonium oxides using vector quantizing variational autoencoder Open
Accurate, high throughput, and unbiased analysis of plutonium oxide particles is needed for analysis of the phenomenology associated with process parameters in their synthesis. Compared to qualitative and taxonomic descriptors, quantitativ…
View article: Measurement of local magnetic fields in actinide tetrafluorides
Measurement of local magnetic fields in actinide tetrafluorides Open
Fluorine-19 magnetic shielding tensors have been measured in a series of actinide tetrafluorides (AnF4) by solid state nuclear magnetic resonance spectroscopy. Tetravalent actinide centers with 0–8 valence electrons can form tetrafluorides…
View article: CoDCon Project (Final Report)
CoDCon Project (Final Report) Open
The co-decontamination (CoDCon) project was established in FY 2016 with the objectives of (a) evaluating the uncertainty in the uranium (U)/plutonium (Pu) ratio in a mixed U/Pu product from a tributyl phosphate (TBP)–based solvent extracti…
View article: Optical Spectroscopic Investigation of Hexavalent Actinide Ions in n-Dodecane Solutions of Tri-butyl Phosphate
Optical Spectroscopic Investigation of Hexavalent Actinide Ions in n-Dodecane Solutions of Tri-butyl Phosphate Open
The extraction of hexavalent actinides An(VI) by tri-butyl phosphate (TBP) was investigated by electronic absorption and vibrational spectroscopies. Through a series of spectral subtractions, vibrational spectra associated with TBP, TBP–HN…
View article: Sensor Fusion: Comprehensive Real-Time, On-Line Monitoring for Process Control via Visible, Near-Infrared, and Raman Spectroscopy
Sensor Fusion: Comprehensive Real-Time, On-Line Monitoring for Process Control via Visible, Near-Infrared, and Raman Spectroscopy Open
On-line monitoring based on optical spectroscopy provides unprecedented insight into the chemical composition of process streams or batches. Amplifying this approach through utilizing multiple forms of optical spectroscopy in sensor fusion…
View article: CoDCon Project: FY 2019 Status Report
CoDCon Project: FY 2019 Status Report Open
The co-decontamination (CoDCon) project was established in FY 2016 with the objectives of (a) evaluating the uncertainty in the uranium (U)/plutonium (Pu) ratio in a mixed U/Pu product from a tributyl phosphate (TBP)–based solvent extracti…
View article: Synthesis of Plutonium Oxide Specimens for a Statistically Designed Nuclear Forensics Study
Synthesis of Plutonium Oxide Specimens for a Statistically Designed Nuclear Forensics Study Open
This report describes the synthesis of plutonium oxide (PuO2) samples at a bench-scale (10 g Pu) to support nuclear forensics research. The key unit operations that were performed included dissolving the PuO2 feed material, purifying the P…
View article: In Situ Monitoring and Kinetic Analysis of the Extraction of Nitric Acid by Tributyl Phosphate in N-Dodecane Using Raman Spectroscopy
In Situ Monitoring and Kinetic Analysis of the Extraction of Nitric Acid by Tributyl Phosphate in N-Dodecane Using Raman Spectroscopy Open
Understanding the fundamental rates of transfer and complex formation is crucial in maintaining optimal efficiency and effectivity in solvent extraction. Methodologies to analyze solvent extraction systems are lacking in that they are comm…