The nature of the volatile technetium species formed during vitrification of borosilicate glass
Vitrification of sodium pertechnetate into borosilicate glass was performed in air at 1100 °C. A glass with a composition similar to the one developed for vitrification of the low activity waste at the Hanford site was used. A red volatile species was observed above 600 °C. The extended X-ray absorption fine structure results indicate the environment of the absorbing Tc atom consists of 2.9(6) O atoms at 1.73(2) Å, 2.2(4) O atoms at 2.02(2) Å, and 0.8(2) O atoms at 2.18(2) Å. The results are consistent with the presence of a mononuclear species with a structure closely related to TcO3(OH)(H2O)2.
KeywordsTechnetium Volatile Red Vitrification X-ray absorbance spectroscopy
- 1.Colby S, Peterson C (1995) Inventory of technetium-99 from reprocessing hanford spent nuclear fuel. Westinghouse Hanford Co. letter report prepared for the U.S. Department of Energy Office of Environmental Restoration and Waste Management. RichlandGoogle Scholar
- 2.McGregor D, Burton-Pye BP, Howell RC, Mbomekalle IM, Lukens WW, Bian F, Mausolf E, Poineau F, Czerwinski KR, Francesconi LC (2011) Synthesis, structure elucidation, and redox properties of 99tc Complexes of lacunary wells-dawson polyoxometalates: insights into molecular 99tc-metal oxide interactions. Inorg Chem 50:1670–1681CrossRefGoogle Scholar
- 3.Langowski M, Darab J, Smith P (1996) Volatility literature of chlorine, iodine, cesium, strontium, technetium and rhenium; technetium and rhenium volatility testing. PNNL-11052, Pacific Northwest National LaboratoryGoogle Scholar
- 8.Kim DS, et al (2005) Tc reductant chemistry and crucible melting studies with simulated hanford low-activity waste. Report PNNL-15131, Pacific Northwest National Laboratory, RichlandGoogle Scholar
- 9.In our experimental setup, no precautions were taken to remove water from the systemGoogle Scholar