Abstract
The fractal properties of the 222 Rn 220 Rn time series were studied using Hurst's rescaled range analysis, as well as the box counting method. The values of the fractal dimensions show that 222Rn and 220Rn can be considered as tracers of a dynamic system whose physical variables continuously interact, some of them in a chaotic, but also deterministic manner. The determined values of Hurst's coefficients (0.809 for 222Rn and 0.896 for 220Rn) highlight a persistent behaviour of both gases and their decay products. These values characterize the overdiffusive media in which the radon atoms and the aerosol particles in the air undergo turbulent diffusion.
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