The nature of the volatile technetium species formed during vitrification of borosilicate glass
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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
Use of the Advanced Photon Source at Argonne was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The authors thank Trevor Low, and Julie Bertoia for outstanding health physics support and Dr. Sungsik Lee at the APS for support during XAS experiments.
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