Record Display for the EPA National Library Catalog


Main Title Simple model for describing radon migration and entry into houses. /
Author Mosley, R. B.
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher US Environmental Protection Agency, Air and Energy Engineering Laboratory,
Year Published 1990
Report Number EPA/600/D-91/021
Stock Number PB91-176743
Additional Subjects Mathematical models ; Radon ; Soil gases ; Environmental transport ; Indoor air pollution ; Flow rate ; Gas flow ; Houses ; Residential buildings ; Radionuclide migration ; Concentration(Composition) ; Soil mechanics ; Diffusion ; Radioactive contaminants ; Air pollution control ; Subslab depressurization systems
Library Call Number Additional Info Location Last
NTIS  PB91-176743 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 32 pages : illustrations ; 28 cm
The paper discusses a simplified model for soil-gas transport through soil surrounding the substructure of a house. The model provides the ability to answer, in semi-quantitative terms, such fundamental questions as: (1) What role does diffusion play in transporting radon to the house/soil interface, where pressure-driven flow tends to dominate the process of entry into the house. (2) Do active subslab depressurization mitigation systems significantly increase the rate of emission of radon into the ambient air. (3) At what flow rate through the subslab depressurization system does dilution of the radon in the soil gas contribute significantly to the performance of the mitigation system. Simplifying assumptions about the distribution of entry routes and driving forces are used to relate indoor air radon levels to soil characteristics and to dynamics within the house. Preliminary validation of the model predictions consists of demonstrating reasonable values for indoor radon concentrations. While it is quite possible to formulate a fairly rigorous mathematical model to describe radon transport through soil, such a model would require rather complex numerical solutions that would be time consuming and expensive to evaluate. Numerical solutions are also cumbersome for evaluating both the relative importance of the individual mechanisms and the appropriateness of alternative boundaries.