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Title: Effect of Technetium-99 sources on its retention in low activity waste glass

Abstract

Small-scale crucible melting tests on simulated waste glass were performed with technetium-99 (Tc-99) introduced as different species in a representative low activity waste simulant. The glass saw an increase in Tc-99 retention when TcO2∙2H2O and various Tc-minerals containing reduced tetravalent Tc were used compared to tests in which pertechnetate with hexavalent Tc was used. We postulate that the increase of Tc retention is likely caused by different reaction paths for Tc incorporation into glass during early stages of melting, rather than the low volatility of reduced tetravalent Tc compounds, which has been a generally accepted idea. Additional studies are needed to clarify the exact mechanisms relevant to the effect of reduced Tc compounds on Tc incorporation into or volatilization from glass melt.

Authors:
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Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1437542
Report Number(s):
PNNL-SA-125641
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: 503; Journal Issue: C
Country of Publication:
United States
Language:
English

Citation Formats

Luksic, Steven A., Kim, Dong-Sang, Um, Wooyong, Wang, Guohui, Schweiger, Michael J., Soderquist, Chuck Z., Lukens, Wayne, and Kruger, Albert A. Effect of Technetium-99 sources on its retention in low activity waste glass. United States: N. p., 2018. Web. doi:10.1016/j.jnucmat.2018.02.019.
Luksic, Steven A., Kim, Dong-Sang, Um, Wooyong, Wang, Guohui, Schweiger, Michael J., Soderquist, Chuck Z., Lukens, Wayne, & Kruger, Albert A. Effect of Technetium-99 sources on its retention in low activity waste glass. United States. doi:10.1016/j.jnucmat.2018.02.019.
Luksic, Steven A., Kim, Dong-Sang, Um, Wooyong, Wang, Guohui, Schweiger, Michael J., Soderquist, Chuck Z., Lukens, Wayne, and Kruger, Albert A. Tue . "Effect of Technetium-99 sources on its retention in low activity waste glass". United States. doi:10.1016/j.jnucmat.2018.02.019.
@article{osti_1437542,
title = {Effect of Technetium-99 sources on its retention in low activity waste glass},
author = {Luksic, Steven A. and Kim, Dong-Sang and Um, Wooyong and Wang, Guohui and Schweiger, Michael J. and Soderquist, Chuck Z. and Lukens, Wayne and Kruger, Albert A.},
abstractNote = {Small-scale crucible melting tests on simulated waste glass were performed with technetium-99 (Tc-99) introduced as different species in a representative low activity waste simulant. The glass saw an increase in Tc-99 retention when TcO2∙2H2O and various Tc-minerals containing reduced tetravalent Tc were used compared to tests in which pertechnetate with hexavalent Tc was used. We postulate that the increase of Tc retention is likely caused by different reaction paths for Tc incorporation into glass during early stages of melting, rather than the low volatility of reduced tetravalent Tc compounds, which has been a generally accepted idea. Additional studies are needed to clarify the exact mechanisms relevant to the effect of reduced Tc compounds on Tc incorporation into or volatilization from glass melt.},
doi = {10.1016/j.jnucmat.2018.02.019},
journal = {Journal of Nuclear Materials},
number = C,
volume = 503,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2018},
month = {Tue May 01 00:00:00 EDT 2018}
}