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We present a method for the determination of the average depth of the activity of Cs-137 in soil, exploiting the information contained in the low-energy part of an in-situ spectrum. The predictive power of the method is evaluated by comparing the results with laboratory measurements of the activity profile and it is shown that the proposed approach yields results of comparable quality in a much shorter measurement time. The method relies on the analysis of the entire spectrum of in-situ gamma-rays from a single spectrum, including the broad peak of scattered photons at the energy between 20 and 80 keV. It is based on a simple notion that the deeper the source is buried beneath the surface, the more numerous the photons scattered in the soil, compared to the corresponding peak of gamma-rays of the original energy. Monte Carlo calculations are necessary for this approach and were based on the GEANT system developed at CERN, Geneva.

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