Abstract
Energy spectra of Cs137 gamma-rays, backscattered from materials of various densities into a surface gauge of the soil density meter, were measured by means of NaI scintillation counter. Changes in the spectra of scattered gamma-rays caused by varying the density were inferred from calculations for Compton single scattering. The density-intensity relationships were obtained by calculations and experiments for several energy regions with several different source-to-detector separations. The plots of measured gamma-ray intensities from water and paraffine deviate from the density-intensity curve. The deviations depend on the source-detector separation and also on the response of the detector to gamma-rays. The gamma-ray intensities, observed for densities from 0.44 to 2.47 g/cm3, fit well into a simple experimental equation.
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