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The diffusion of tritiated water and anionic species was studied through unsaturated compacted materials with variable clay content. These materials were designed to be analogous to the Callovo-Oxfordian claystone, a potential host-rock for disposal of high-level radioactive wastes. The diffusion parameters under such conditions were determined using modified through-diffusion cells in which the suction is generated by the process of osmosis. This device leads to saturation degree values ranging from about 70 to 100%. The results show that the diffusion through the unsaturated samples is clearly slower than that in the fully saturated samples, with steady-state fluxes decreasing by...

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