A5062992903- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Radioactive element chemistry and processing
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Geologic Mapping
- Isotope Analysis in Ecology
- Clay minerals and soil interactions
Illinois Archaeological Survey
2023
University of Illinois Urbana-Champaign
2009-2013
Pacific Northwest National Laboratory
2010
Lawrence Berkeley National Laboratory
2010
Research Article| July 01, 2009 Variations in 238U/235U uranium ore deposits: Isotopic signatures of the U reduction process? Charles John Bopp, IV; IV 1University Illinois at Urbana-Champaign, Department Geology, 245 Natural History Building, 1301 West Green Street, Urbana, 61801, USA Search for other works by this author on: GSW Google Scholar Craig C. Lundstrom; Lundstrom Thomas M. Johnson; Johnson Justin J.G. Glessner Author and Article Information Publisher: Geological Society America...
The attenuation of groundwater contamination via chemical reaction is traditionally evaluated by monitoring contaminant concentration through time. However, this method can be confounded common transport processes (e.g., dilution, sorption). Isotopic techniques bypass the limits methods, and so may provide improved accuracy in determining extent reaction. We apply measurements 238U/235U to a U bioremediation field experiment at Rifle Integrated Field Research Challenge Site Rifle, Colorado....
Isotopes fractionate in thermal gradients, but there is little quantitative understanding of this effect complex fluids. Here we present results experiments and molecular dynamics simulations on silicate melts. We show that isotope fractionation arises from classical mechanical effects, a scaling relation based Chapman-Enskog theory predicts the behavior seen fluids without arbitrary fitting parameters. The analysis reveals network forming elements (Si O) significantly less than modifiers...