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Remote sensing water content in a clay / sand mixture using Impedance Computed Tomography

The Impedance Computed Tomography method provides a way to measure groundwater infiltration of bentonite clay / sand mixture being considered as a buffer in a nuclear fuel waste disposal vault. It is a remote sensing technique using current stimulation. An iterative algorithm called the “Algorithm of Wexler” is used to process the voltage measurements. The algorithm models the buffer material as a distribution of admittances. Important to this application is to understand the electrical properties of the buffer material. In situ measurements of the resistivity and capacitance of reference buffer were made and the results are discussed in the context of the design of a data logging system for field tests using this method.