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ESTIMATION OF RADON CONCENTRATION IN HOUSE USING A
SIMPLE VENTILATION MODEL

B. Collignan - J.R. Millet
C.S.T.B. - Centre Scientifique et Technique du Bâtiment
BP 02 F-77421 MARNE LA VALLE CEDEX 2 - France
e-mail : collignan@cstb.fr - millet@cstb.fr
Fax n° : 33 164 68 83 50

The aim of this study is to evaluate the efficiency of different ventilation strategies for a house and for
a subfloor void to reduce the radon concentration level of the indoor air.
A steady-state analytical ventilation model is derived to estimate the indoor air radon concentration in
houses on ground floor or with subfloor voids. It enables to analyse the influence of different
environmental and construction parameters on this concentration, in a way to better define and
dimension technical solutions to reduce radon concentration in indoor air.
First main results obtained with this model are presented in this article. The model developped could
also be a help to dimension natural ventilation of a void equiped with specific duct to use stack
effects.