Abstract
This study investigates the transport of Radon (222Rn) which is the second leading cause of lung cancer after smoking. A new and optimized finite element numerical model (FERM-1D, Finite Element Radon Modeling in one dimension) of Radon transport is developed and tested with analytical models’ solutions under different conditions in addition to verification against field data for soils with multi-layer behavior. The interaction between the Radon 222Rn different mechanisms such as diffusion, advection, decay and generation is explained in details. Transport numbers are proposed that determine conditions under which each mechanism of diffusion, advection, decay and generation dominates. A transport similarity concept is presented in which different combination of mechanisms and model parameters can produce the same Radon activity concentration profile. Moreover, new prospective is presented to modeling soils with multi-layer Radon transport characteristics and behavior.
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