Abstract
Statistical analyses were performed for 50 sets of equal interval data of natural terrestrial gamma-ray dose rates observed for various distances. The multiple regression analysis shows that the variance of a set of data can be expressed as a function of the length and the mean value of the data with relatively high correlation coefficient. One-dimensional spectral analyses for the 50 sets of data suggest that the structures of fluctuation are similar to one another for various distances of observation starting from 0.1 km to about 7 000 km. Each power spectral density can be approximated in the form of P (k) =0.780×10-3 m2.20 k-1.18 where k (cycle/km) and m (nGy/h) are the wave number and the mean, respectively.
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