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

Journal Article · · Journal of Nuclear Materials
 [1]; ORCiD logo [1];  [1];  [1];  [1];  [1]; ORCiD logo [2];  [3]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. USDOE Office of River Protection, Richland, WA (United States)
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© 2018 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 TcO 2 ∙2H 2 O and various Tc-minerals containing reduced tetravalent Tc were used compared to tests in which pertechnetate with heptavalent 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 the glass melt.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); SC-22.1 USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
AC05-76RL01830; AC02-05CH11231; AC02-76SF00515
OSTI ID:
1425497
Alternate ID(s):
OSTI ID: 1436676; OSTI ID: 1548661
Report Number(s):
PNNL-SA-125641; PII: S0022311517311261; TRN: US1802122
Journal Information:
Journal of Nuclear Materials, Vol. 503; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

Figures / Tables (12)

Figure 1(p. 26)figure Figure 1
Figure 2(p. 27)figure Figure 2
Figure 3(p. 28)figure Figure 3
Figure 4(p. 29)figure Figure 4
Figure 5(p. 30)figure Figure 5
Figure 6(p. 31)figure Figure 6
Figure 7(p. 32)figure Figure 7
Figure 8(p. 33)figure Figure 8
Table 1(p. 34)table Table 1
Table 2(p. 35)table Table 2
Table 3(p. 35)table Table 3
Table 4(p. 36)table Table 4

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36 MATERIALS SCIENCE