NUMERICAL SIMULATION OF THE MOBILITY OF RADON TO DETECT THE TERRESTRIAL STRUCTURES BY THE FDTD METHOD IN 3D

In this work, we have exploited a recent developed numerical method for studying the propagation of electromagnetic waves in different media called, Finite Difference Time Domain (FDTD) to retrieve certain information (length, depth and / or width of structures) from the concentration of Radon detected at the surface. As in geology, the faults constitute a corridor of circulation of fluids among the Radon. This method proves to be suitable for the detection of the hidden faults not appearing on the surface. The development of the FDTD model is based on the simultaneous resolution of the radon transport equation in a porous and homogeneous medium that is the soil. That is to say, this equation describes the concentration of radon per pore volume unit. The numerical results compared to those made in the laboratory by a situation simulation of a back filled with soil and powered by a source of Radon at its base