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Theoretical convective-transport model of indoor radon decay products

Thesis/Dissertation ·
OSTI ID:5944430
A numerical model is developed which is capable of simulating the generation, convective and diffusive transport, and removal mechanisms of radon and radon decay products (daughters). The model is based on fundamental mass-transport equations. Specifically, separate differential equations describe the spatially-dependent concentrations of both unattached (free) daughters and daughters attached to airborne aerosols; the equations are coupled through source and sink terms which include the radioactive decay rate, attachment rate, and recoil factor. Surface deposition of airborne daughters by molecular diffusion is accounted for through boundary conditions. The mass-transport model is employed to examine the influence of key parameters on free and attached deposition rates of the first three radon daughters, with a particular emphasis on the first free daughter /sup 218/Po. The theoretical results indicate that the deposition velocity decreases for subsequent daughters in the decay chain. The results of the parametric sensitivity studies are used to examine the adequacy of parametric models of deposition, interpret experimental measurements, and make recommendations regarding further experimental studies to investigate the dependence of deposition on environmental conditions.
Research Organization:
California Univ., Berkeley (USA)
OSTI ID:
5944430
Country of Publication:
United States
Language:
English

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Related Subjects

500300* -- Environment
Atmospheric-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BOUNDARY CONDITIONS
CONVECTION
DAUGHTER PRODUCTS
DAYS LIVING RADIOISOTOPES
DIFFERENTIAL EQUATIONS
DIFFUSION
ENERGY TRANSFER
ENVIRONMENTAL TRANSPORT
EQUATIONS
EVEN-EVEN NUCLEI
HEAT TRANSFER
HEAVY NUCLEI
ISOTOPES
MASS TRANSFER
MATHEMATICAL MODELS
MINUTES LIVING RADIOISOTOPES
NUCLEI
POLONIUM 218
POLONIUM ISOTOPES
RADIOISOTOPES
RADIONUCLIDE MIGRATION
RADON 222
RADON ISOTOPES