Temperature-dependent concentration profiles of HTO, 36Cl⁻, 35SO₄²⁻ and 75SeO₃²⁻ in compacted FEBEX bentonite under different dry densities.

This dataset contains experimentally concentration profiles of four radionuclides (HTO, 36Cl⁻, 35SO₄²⁻, and 75SeO₃²⁻) obtained from diffusion experiments in compacted FEBEX bentonite. Experiments were performed under different temperatures (25°C, 40°C, 60°C and 80°C) and two dry density conditions (1.40-1.65 g/cm3), allowing the evaluation of temperature-dependent transport behaviour in compacted clay barriers relevant for radioactive waste disposal. The data are organized in an Excel file containing five sheets corresponding to porewater composition and each radionuclide (HTO, 36Cl⁻, 75SO₄²⁻, 75SeO₃²⁻) + ReadMe. The dataset includes normalized concentration as a function of distance (cm) for each radionuclide. td means diffusion time (seconds). This dataset was generated within the EURAD-2 project (European Partnership on Radioactive Waste Management), Grant Agreement No. 101166718).