The influence of fractal size distribution of covers on radon exhalation from uranium mill tailings

► Size distributions of covering materials exhibit fractal structure. ► Effectiveness of reducing Rn exhalation from tailings is related to fractal texture of size distribution of covers. ► Attenuation coefficient of Rn exhalation increases with the increasing fractal dimension of covers. ► Empirical equation of attenuation coefficients in relation to fractal dimension and thickness of covers.