NDLI: Iron Mössbauer redox and relation to technetium retention during vitrification

Content Provider	Springer Nature Link
Author	Muller, Isabelle S. Viragh, Carol Gan, Hao Matlack, Keith S. Pegg, Ian L.
Copyright Year	2009
Abstract	Technetium-99 is a long half-life radioactive fission product whose high volatility during waste vitrification (National Research Council, 2001; Migge, Mat Res Symp Proc 127:205–213, 1989) is a factor in the safe disposal of radioactive waste. Oxidation states of +7, +4 mostly, and some traces of metal have been observed in the glass (Migge, Mat Res Symp Proc 176:411–417, 1990; Darab and Smith, Chem Mater 8:1004–1021, 1996) with Tc7 + more volatile than Tc4 + , leading to a range of technetium retention in the glass varying from 0.8% to 92%. In the present experiments, a simulated high-sulfate Hanford tank waste was vitrified using a slurry fed joule heated furnace producing about 30 kg of glass per day. Various combinations of sucrose and urea were used as denitration and reducing agents in order to optimize sulfate and technetium retention. Since iron oxide is used as a glass additive, Fe-Mössbauer spectroscopy was a vital tool to monitor the melt redox through its Fe2 + /Fetot ratio. A Mössbauer glass redox scale was designed to relate the technetium speciation to its retention in the glass.
Starting Page	17
Ending Page	24
Page Count	8
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	191
Issue Number	1-3
e-ISSN	15729540
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-03-26
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Radioactive waste glass Technetium Iron redox Mössbauer spectroscopy Surfaces and Interfaces, Thin Films Condensed Matter Atoms, Molecules, Clusters and Plasmas Nuclear Physics, Heavy Ions, Hadrons
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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