Unified theory of radon transport in porous media: Model benchmark and soil parameter evaluations. Project annual report.

摘要

This report documents the activities by Rogers and Associates Engineering Corporation personnel in the second year of a grant from the Office of Health and Environmental Research at the US Department of Energy. The project objective is to integrate theories of all significant radon generation and transport mechanisms into a unified, self-consistent theory. During the second year of the project, the following activities were performed. Several field permeabilities were measured to develop a soils data base for a simple permeability correlation. Simple soil gas permeability and radon diffusion coefficient correlations were developed from the RAE data base. A methodology was developed to characterize the air permeabilities and radon diffusion coefficients of soils in general, and the Soil Conservation Service soil classifications in particular. The RAETRAN code was benchmarked against two different sets of measurements. Using RAETRAD, a multidimensional code that was developed with internal funds, the radon source/receptor coupling characteristics were investigated. Several important trends are identified. 76 refs., 19 figs., 5 tabs. (ERA citation 15:033140)