Abstract
An X-ray radiography method for the determination of diffusion coefficients in rock has been modified to provide an estimation of diffusion–reaction parameters for the sorbing tracer, cesium (Cs+). Cesium tracer diffusion and sorption on cation exchange sites can be monitored in intact rock samples using data extracted from radiographs to plot time-series relative-concentration profiles of Cs+ as a function of transport distance. Cesium was found to be a very good tracer for these experiments because of the sensitivity of the X-ray attenuation measurements to Cs+ concentration.Reactive-transport modeling coupled with parameter estimation software was used to match experimental data and estimate pore diffusion coefficients for Cs+ (Dp-Cs=7.6×10−11m2/s), single-site selectivity coefficients for Cs+ exchange (logKCs+/Na+=1.5) and cation exchange capacity (CEC=8.4meq/100g) for drill core samples of Queenston Formation shale, from the Michigan Basin in Ontario, Canada.
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