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RAETRAD MODEL OF RADON GAS GENERATION, TRANSPORT, AND INDOOR ENTRY
Nielson, K., V. C. Rogers, V. Rogers, AND R. Holt. RAETRAD MODEL OF RADON GAS GENERATION, TRANSPORT, AND INDOOR ENTRY. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-94/198 (NTIS 95-142030), 1994.
The report describes the theoretical basis, implementation, and validation of the Radon Emanation and Transport into Dwellings (RAETRAD) model, a conceptual and mathematical approach for simulating radon (222Rn) gas generation and transport from soils and building foundations to the indoor environment. t has been implemented in a computer code of the same name to provide a relatively simple, inexpensive means of estimating indoor radon entry rates and concentrations. AETRAD uses the complete, multi-phase differential equations to calculate radon generation, decay, and transport by both diffusion and advection (with pressure-driven air flow). he equations are implemented in a steady-state, 2-dimensional finite-difference mode with elliptical-cylindrical geometry for maximum efficiency and modeling detail. or validation, the air flow part of RAETRAD was compared with a 2-dimensional analytical calculation of air flow through a uniform field. ariations of < 1% were observed between the analytical and numerical pressure fields. he radon generation, decay, and transport part of RAETRAD was validated by similar comparisons with 1-dimensional analytical calculations for open and concrete-covered soils. ost radon concentration profiles and surface radon fluxes for these comparisons were also within 1%.
Record Details:Record Type: DOCUMENT (PUBLISHED REPORT/REPORT)
Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL RISK MANAGEMENT RESEARCH LABORATORY
AIR POLLUTION PREVENTION AND CONTROL DIVISION
INDOOR ENVIRONMENT MANAGEMENT BRANCH