Many researchers hold that natural gamma-ray curves have fractal characteristics. Using the fractal theory, the authors studied some natural gamma-ray curves. The result shows that the fractal characteristics of the natural gamma-ray curves are related to the extent of radioactive concentration in strata. The fractal characteristics exist within a certain range but disappear when the radioactive concentration exceeds a certain value. The adaptability of fractal characteristics in natural gamma-ray curves should be carefully analyzed.
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