EVALUATION OF GAMMA-RAY INTENSITY OF LAYERED GROUND

Abstract

The monitoring of natural and arti cial gamma elds has become an indispensable auxiliary tool not only in the search for minerals or geophysical research but also as a standalone method for assessing environmental conditions during accidents, locating highly radioactive sources, and implementing antiterrorist measures. Nowadays, the most actively developing method of monitoring gamma elds is the remote method, primarily involving the use of remotely piloted vehicles. Most problems of gamma eld monitoring can be solved more e ectively by incorporating appropriate mathematical support. In particular, accurately estimating the intensity of gamma radiation of contaminated soils requires proper consideration of the processes a ecting the formation of gamma quanta ow, including attenuation processes. Using the exponential law of gamma ray attenuation in a medium and their geometric divergence, we investigate the problem of gamma eld intensity in a layered soil massif. In our research, we derived an analytical expression for describing the eld intensity of a two-layer soil depending on the density, thicknesses, and mass attenuation coe cients of the layers, as well as the height of the detector above the soil surface. We identi ed unique characteristics in the behavior of the eld intensity function for di erent layer con gurations and at considerable heights above the soil surface. The algorithm for calculating the intensity of the gamma eld is generalized for scenarios involving a nite number of layers. The results obtained could be valuable for developing solutions to inverse problems that arise during remote detection of gamma elds in contaminated areas using, for example, unmanned aerial vehicles.