You need JavaScript to view this

Entry of soil gas and radon into houses

Thesis/Dissertation:

Abstract

Entry of soil gas and radon into houses has been investigated by experiments conducted at radon test structures and numerical or analytical modelling. The numerical model solves the steady-state equations for Darcy flow of soil-gas and combined diffusive and advective transport of radon. Model calculations were compared with results from field experiments conducted at Risoe National Laboratory, and it was found that there was good agreement between measured and modelled pressure coupling and radon concentration profiles. Discrepancies regarding absolute values of soil-gas entry rates and radon concentrations were observed. The numerical model has been used to study the importance of soil and building related factors on radon entry rates into slab-on-grade houses. It was found that, for a house with a 3 mm perimeter crack along the floor-wall joint, the entry was mainly determined by the soil permeability and building related factors such as house depressurization and presence of a capillary breaking layer of gravel below the slab. In a house with a bare soil floor, the diffusivity of the soil was found to be of principal importance for the entry rate even for moderate permeabilities. An analytical model was developed for the purpose of studying soil-gas entry rates into  More>>
Authors:
Publication Date:
Apr 01, 1992
Product Type:
Thesis/Dissertation
Report Number:
RISO-R-623
Reference Number:
SCA: 540130; 540230; PA: AIX-24:005711; SN: 93000930849
Resource Relation:
Other Information: TH: Thesis (Ph.D.).; PBD: Apr 1992
Subject:
54 ENVIRONMENTAL SCIENCES; RADON 222; HOUSES; ADVECTION; AIR INFILTRATION; CONVECTION; DARCY LAW; DIFFUSION; ENVIRONMENTAL TRANSPORT; FINITE DIFFERENCE METHOD; GAS FLOW; MATHEMATICAL MODELS; PERMEABILITY; SOILS; TRANSFER FUNCTIONS; 540130; 540230; RADIOACTIVE MATERIALS MONITORING AND TRANSPORT
OSTI ID:
10118789
Research Organizations:
Risoe National Lab., Roskilde (Denmark). Nuclear Safety Research Dept.; Technical Univ. of Denmark, Lyngby (Denmark)
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: ON: DE93611378; ISBN 87-550-1804-1; TRN: DK9200128005711
Availability:
OSTI; NTIS; INIS
Submitting Site:
DKN
Size:
[86] p.
Announcement Date:
Jun 30, 2005

Thesis/Dissertation:

Citation Formats

Andersen, C E. Entry of soil gas and radon into houses. Denmark: N. p., 1992. Web.
Andersen, C E. Entry of soil gas and radon into houses. Denmark.
Andersen, C E. 1992. "Entry of soil gas and radon into houses." Denmark.
@misc{etde_10118789,
title = {Entry of soil gas and radon into houses}
author = {Andersen, C E}
abstractNote = {Entry of soil gas and radon into houses has been investigated by experiments conducted at radon test structures and numerical or analytical modelling. The numerical model solves the steady-state equations for Darcy flow of soil-gas and combined diffusive and advective transport of radon. Model calculations were compared with results from field experiments conducted at Risoe National Laboratory, and it was found that there was good agreement between measured and modelled pressure coupling and radon concentration profiles. Discrepancies regarding absolute values of soil-gas entry rates and radon concentrations were observed. The numerical model has been used to study the importance of soil and building related factors on radon entry rates into slab-on-grade houses. It was found that, for a house with a 3 mm perimeter crack along the floor-wall joint, the entry was mainly determined by the soil permeability and building related factors such as house depressurization and presence of a capillary breaking layer of gravel below the slab. In a house with a bare soil floor, the diffusivity of the soil was found to be of principal importance for the entry rate even for moderate permeabilities. An analytical model was developed for the purpose of studying soil-gas entry rates into houses in response to non-static driving forces. It is based on the analogy between a `buried drain` and a basement house with a perimeter crack. The structure was depressurized sinusoidally in time and the frequency dependent pressure couplings were measured. There was fairly good agreement between theoretical and experimental results. (LN) (26 tabs., 30 ills., 66 refs.).}
place = {Denmark}
year = {1992}
month = {Apr}
}