Seasonal variation in radon concentration of 3000 dwellings with model comparisons.
Indoor randon concentration of two consecutive half-year measuring periods in 3074 Finnish dwellings were analysed.
The periods were the warmest and coldest half-year periods in Finland.
The mean of winter/summer concentration ratio in all low-rise residential buildings was 1.28, and in houses with winter concentrations of<50,50-100,100-200 and>200 Bq. m-3,0.97,1.22,1.34, and 1.55, respectively.
The results are in agreement with the results predicted by the model, which takes into account the varying contribution of diffusive and convective randon entry as well as the contribution of stack effect and wind induced air infiltration.
The model is a useful tool for estimating the average correction factor for the annual average radon concentration from the two months measurements used in Finland.
Typical correction factors vary in the range of 1.0-0.7, depending on the outdoor temperature and on randon concentraiton level.
Model comparison with winter/summer ratios measured in houses with slab on grade suggests an average diffusive randon entry rate of 7 Bq. m-3. h-1 and a convective entry rate of ratios for houses with varying randon levels, creates inaccuracy in the information on seasonal variation.
Surprisingly, the behaviour of the winter/summer ratio in blocks of flats was very similar to that in low-rise residential buildings.
The results support the interpretation that soil air leakage also contributes unexpectedly to the randon concentration in flats.
Mots-clés Pascal : Modélisation, Etude comparative, Homme, Dosimétrie, Variation saisonnière, Finlande, Logement habitation, Réchauffement, Refroidissement, Eté, Hiver, Radon, Air, Europe
Mots-clés Pascal anglais : Modeling, Comparative study, Human, Dosimetry, Seasonal variation, Finland, Housing, Warming, Cooling, Summer, Winter, Radon, Air, Europe
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0340941
Code Inist : 002B30A02A. Création : 01/03/1996.