Journal
CHEMOSPHERE
Volume 269, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.128674
Keywords
Iodide diffusion; Opalinus clay; In-situ downhole X-ray fluorescence; Radionuclide transport; Porous media; Nuclear waste disposal
Categories
Funding
- Federal Agency for Nuclear Control (FANC)
- National Cooperative for the Disposal of Radioactive Waste (NAGRA)
- Nuclear Waste Management Organization (NWMO)
- Radioactive Waste Management (RWM)
- Federal Office of Topography Swisstopo
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The Mont Terri rock laboratory has conducted extensive experimental research over the past two decades, focusing on improving our understanding of radionuclide transport within Opalinus Clay. The latest DR-B experiment utilizes in-situ X-ray fluorescence to monitor an iodide plume within the Opalinus Clay, providing a novel method for large-scale and long-term data acquisition.
During the last two decades, the Mont Terri rock laboratory has hosted an extensive experimental research campaign focusing on improving our understanding of radionuclide transport within Opalinus Clay. The latest diffusion experiment, the Diffusion and Retention experiment B (DR-B) has been designed based on an entirely different concept compared to all predecessor experiments. With its novel experimental methodology, which uses in-situ X-ray fluorescence (XRF) to monitor the progress of an iodide plume within the Opalinus Clay, this experiment enables large-scale and long-term data acquisition and provides an alternative method for the validation of previously acquired radionuclide transport parameters. After briefly presenting conventional experimental methodologies used for field diffusion experiments and highlighting their limitations, this paper will focus on the pioneer experimental methodology developed for the DR-B experiment and give a preview of the results it has delivered thus far. (C) 2020 Elsevier Ltd. All rights reserved.
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