Figure 1: Radon concentration and Hurst exponent evolution in dwelling D1. In all Figureures, the top sub-Figureure is the evolution of radon concentration, the middle sub-Figureure is the evolution of Hurst exponent and the bottom sub-Figureure is the evolution of the square of the linear correlation coefficient. R/S analysis: (a) slidingwindow of length 8, step 1; (b) sliding-window of length 32, step 1; (c) lumping of window-length 32.