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A long-term single-borehole diffusion experiment (DI) using tritiated water (HTO) and stable iodide ( 127 I - ) was carried out In the Opalinus Clay of the Mont Terri Underground Rock Laboratory (URL). Diffusion coefficients  D  L  and accessible porosity for HTO,  36 Cl -  and  125 I -  were also measured on centimetric Opalinus clay samples using the through diffusion technique. The evolution of tritium and iodide concentration in the injection system over time and  in situ  profiles were interpreted with a 3-D numerical simulation. A detailed analysis of the results pointed out the effect of a disturbed zone around the borehole with higher diffusion coefficients. The best estimate values for HTO and iodide in the undisturbed rock are  D  L  = 5×10 -11  m 2 /s and  D  L  = 1.5×10 -11  m 2 /s respectively. For the laboratory tests,  D  L  values for HTO are in the range of 5×10 -11  m 2 /s to 8.5×10 -11  m 2 /s. For  125 I -  and  36 Cl -  the measured values are  D  L =νmber1.4×10 -11  and  D  L =1.6×10 -11  m 2 /s respectively.

Comparison between in situ and laboratory diffusion studies of HTO and halides in Opalinus Clay from the Mont Terri