Evidence of technetium and iodine release from a sodalite-bearing ceramic waste form |
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| Institution: | 1. Pacific Northwest National Laboratory, Richland, WA 99352, USA;2. Oak Ridge National Laboratory, Oak Ridge, TN, USA;1. Planta Piloto de Ingeniería Química (UNS-CONICET), Camino La Carrindanga Km 7, 8000 Bahía Blanca, Argentina;2. Instituto de Física del Sur (UNS-CONICET) and Departamento de Física, Universidad Nacional del Sur (UNS), Av. Alem 1253, 8000 Bahía Blanca, Argentina;1. Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan;2. Department of Advanced Device Materials, Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga 816-8180, Japan;1. National Metal and Materials Technology Center, 114 Thailand Science Park, Klong Nueng, Klong Luang, Pathumthani 12120, Thailand;2. Center of Excellence in Nanotechnology, Asian Institute of Technology, P.O. Box 4, Klong Luang, Pathumthani 12120, Thailand;3. Physics Department, College of Science, Sultan Qaboos University, P.O. Box 33, 123 Al-Khoudh, Oman;4. Chair in Nanotechnology, Water Research Center, Sultan Qaboos University, 123 Al-Khoudh, Oman;1. Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences, Moscow, Russia;2. SRC “Kurchatov Institute,\", Moscow, Russia;3. Lomonosov Moscow State University, Moscow, Russia |
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| Abstract: | Sodalites have been proposed as a possible host of certain radioactive species, specifically 99Tc and 129I, which may be encapsulated into the cage structure of the mineral. To demonstrate the ability of this framework silicate mineral to encapsulate and immobilize 99Tc and 129I, single-pass flow-through (SPFT) tests were conducted on a sodalite-bearing multi-phase ceramic waste form produced through a steam reforming process. Two samples made using a steam reformer samples were produced using non-radioactive I and Re (as a surrogate for Tc), while a third sample was produced using actual radioactive tank waste containing Tc and added Re. One of the non-radioactive samples was produced with an engineering-scale steam reformer while the other non-radioactive sample and the radioactive sample were produced using a bench-scale steam reformer. For all three steam reformer products, the similar steady-state dilute-solution release rates for Re, I, and Tc at pH (25 °C) = 9 and 40 °C were measured. However, it was found that the Re, I, and Tc releases were equal or up to 4.5x higher compared to the release rates of the network-forming elements, Na, Al, and Si. The similar releases of Re and Tc in the SPFT test, and the similar time-dependent shapes of the release curves for samples containing I, suggest that Re, Tc, and I partition to the sodalite minerals during the steam reforming process. |
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| Keywords: | Technetium Radioactive waste form Mineral dissolution Sodalite |
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