Simulation of the steady-state transport of radon from soil into houses with basements under constant negative pressure
A theoretical model was developed to simulate this phenomenon, under some specific assumptions. The model simulates: the generation and decay of radon within the soil; its transport throughout the soil due to diffusion and convection induced by the pressure disturbance applied at a crack in the basement; its entrance into the house through the crack; and the resultant indoor radon concentration. The most important assumptions adopted in the model were: a steady-state condition; a house with a basement; a geometrically well-defined crack at the wall-floor joint in the basement; and a constant negative pressure applied at the crack in relation to the outside atmospheric pressure. Two three-dimensional finite-difference computer programs were written to solve the mathematical equations of the model. The first program, called PRESSU, was used to calculate: the pressure distribution within the soil as a result of the applied disturbance pressure at the crack; and the resultant velocity distribution of the soil gas throughout the soil matrix. The second program, called MASTRA, was used to: solve the radon mass-transport equation, and to calculate the concentration distribution of radon in the soil gas within the whole soil; and to calculate the entry rate of radon through the crack into the basement, and the final indoor radon concentration. A parametric sensitivity analysis performed on the model, revealed several features of the mechanisms involved in the transport of radon into the house. 84 refs., 66 figs., 16 tabs.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5486695
- Report Number(s):
- LBL-24378; ON: DE88006345; TRN: 88-011264
- Resource Relation:
- Other Information: Thesis (Ph.D.). Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
ENVIRONMENTAL TRANSPORT
MATHEMATICAL MODELS
RADON 222
ECOLOGICAL CONCENTRATION
ATMOSPHERIC PRESSURE
BASEMENTS
CRACKS
DAUGHTER PRODUCTS
FLOW RATE
FORECASTING
INDOOR AIR POLLUTION
M CODES
P CODES
RESIDENTIAL BUILDINGS
RESPONSE MODIFYING FACTORS
SOILS
STEADY-STATE CONDITIONS
AIR POLLUTION
ALPHA DECAY RADIOISOTOPES
BUILDINGS
COMPUTER CODES
DAYS LIVING RADIOISOTOPES
EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPES
MASS TRANSFER
NUCLEI
POLLUTION
RADIOISOTOPES
RADON ISOTOPES
320107* - Energy Conservation
Consumption
& Utilization- Building Systems- (1987-)
500300 - Environment
Atmospheric- Radioactive Materials Monitoring & Transport- (-1989)