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Wooyong Um

Institution
Pohang University of Science & Technology

Projects

Fe Oxide Waste Form for Tc Immobilization

Lead Institution
Pohang University of Science & Technology
Principal Investigator
Wooyong Um
The objective of this work is to develop a waste form that will sequester Tc in a Goethite matrix that will be resistant to Tc-leaching. Goethite (?-FeOOH) is a low-temperature secondary weathering…

High Resolution Multinuclear NMR of Waste-Weathered Hanford Sediments

Lead Institution
University of Arizona
Principal Investigator
Jon Chorover
Project type
Large-Scale EMSL Research
Our research team is part of a multi-laboratory/university project funded by the Department of Energy that is investigating the fate of uranium and strontium in waste-weathered sediments such as…

Synthesis of micron sized Tc-incorporated trevorite

Lead Institution
Pohang University of Science & Technology
Principal Investigator
Wooyong Um
Abstract: Low retention of Tc in a final borosilicate glass is attributed to high volatilization rate of Tc species from the melt process. Two major Tc species, Tc4+ and Tc7+ show different…

Radionuclide Immobilization in Reducing Cementitious Materials

Lead Institution
Savannah River National Laboratory
Principal Investigator
Daniel Kaplan
Project type
Large-Scale EMSL Research
Reducing cementitious materials are used as waste forms and engineered barriers for low-level radioactive waste disposal in the vadose zone. These materials are specifically formulated to contain…

Tc removal by mineral transformation of Fe(OH)2(s)

Lead Institution
Pohang University of Science & Technology
Principal Investigator
Wooyong Um
The objective of this work is to provide additional fundamental understanding of the Tc removal by the mineral transformation process of ferrous hydroxide, Fe(OH)2(s) in solution. The data generated…