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Title: Enhanced 99 Tc retention in glass waste form using Tc(IV)-incorporated Fe minerals

Abstract

Technetium (99Tc) immobilization by doping into iron oxide mineral phases may alleviate the problems with Tc volatility during vitrification of nuclear waste. Reduced Tc, Tc(IV), substitutes for Fe(III) in the crystal structure by a process of Tc reduction from Tc(VII) to Tc(IV) followed by co-precipitation of Fe oxide minerals. Two Tc-incorporated Fe minerals (Tc-goethite and Tc-magnetite/maghemite) were prepared and tested for Tc retention in glass melt samples at temperatures between 600 – 1,000 oC. After being cooled, the solid glass specimens prepared at different temperatures were analyzed for Tc oxidation state using Tc K-edge XANES. In most samples, Tc was partially oxidized from Tc(IV) to Tc(VII) as the melt temperature increased. However, Tc retention in glass melt samples prepared using Tc-incorporated Fe minerals were moderately higher than in glass prepared using KTcO4 because of limited and delayed Tc volatilization.

Authors:
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Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1398220
Report Number(s):
PNNL-SA-123344
Journal ID: ISSN 0022-3115; 830403000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 495
Country of Publication:
United States
Language:
English

Citation Formats

Um, Wooyong, Luksic, Steven A., Wang, Guohui, Saslow, Sarah, Kim, Dong-Sang, Schweiger, Michael J., Soderquist, Chuck Z., Bowden, Mark E., Lukens, Wayne W., and Kruger, Albert A. Enhanced 99 Tc retention in glass waste form using Tc(IV)-incorporated Fe minerals. United States: N. p., 2017. Web. doi:10.1016/j.jnucmat.2017.09.007.
Um, Wooyong, Luksic, Steven A., Wang, Guohui, Saslow, Sarah, Kim, Dong-Sang, Schweiger, Michael J., Soderquist, Chuck Z., Bowden, Mark E., Lukens, Wayne W., & Kruger, Albert A. Enhanced 99 Tc retention in glass waste form using Tc(IV)-incorporated Fe minerals. United States. doi:10.1016/j.jnucmat.2017.09.007.
Um, Wooyong, Luksic, Steven A., Wang, Guohui, Saslow, Sarah, Kim, Dong-Sang, Schweiger, Michael J., Soderquist, Chuck Z., Bowden, Mark E., Lukens, Wayne W., and Kruger, Albert A. Wed . "Enhanced 99 Tc retention in glass waste form using Tc(IV)-incorporated Fe minerals". United States. doi:10.1016/j.jnucmat.2017.09.007.
@article{osti_1398220,
title = {Enhanced 99 Tc retention in glass waste form using Tc(IV)-incorporated Fe minerals},
author = {Um, Wooyong and Luksic, Steven A. and Wang, Guohui and Saslow, Sarah and Kim, Dong-Sang and Schweiger, Michael J. and Soderquist, Chuck Z. and Bowden, Mark E. and Lukens, Wayne W. and Kruger, Albert A.},
abstractNote = {Technetium (99Tc) immobilization by doping into iron oxide mineral phases may alleviate the problems with Tc volatility during vitrification of nuclear waste. Reduced Tc, Tc(IV), substitutes for Fe(III) in the crystal structure by a process of Tc reduction from Tc(VII) to Tc(IV) followed by co-precipitation of Fe oxide minerals. Two Tc-incorporated Fe minerals (Tc-goethite and Tc-magnetite/maghemite) were prepared and tested for Tc retention in glass melt samples at temperatures between 600 – 1,000 oC. After being cooled, the solid glass specimens prepared at different temperatures were analyzed for Tc oxidation state using Tc K-edge XANES. In most samples, Tc was partially oxidized from Tc(IV) to Tc(VII) as the melt temperature increased. However, Tc retention in glass melt samples prepared using Tc-incorporated Fe minerals were moderately higher than in glass prepared using KTcO4 because of limited and delayed Tc volatilization.},
doi = {10.1016/j.jnucmat.2017.09.007},
journal = {Journal of Nuclear Materials},
number = ,
volume = 495,
place = {United States},
year = {Wed Nov 01 00:00:00 EDT 2017},
month = {Wed Nov 01 00:00:00 EDT 2017}
}