caa a22 4500 39750439X CHVBK 20180308164540.0 cr unu---uuuuu 161202e19950301xx s 000 0 eng 10.1093/oxfordjournals.rpd.a082634 doi 0144-8420 pii (NATIONALLICENCE)oxford-10.1093/oxfordjournals.rpd.a082634 Arvela H. Seasonal Variation in Radon Concentration of 3000 Dwellings with Model Comparisons [Elektronische Daten] [H. Arvela] Indoor radon concentration of two consecutive half-year measuring period 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 radon 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 radon concentration levels. Model comparison with winter/summer ratios measured in houses with slab on grade suggests an average diffusive radon entry rate of 7 Bq.m-3.h-1 and a convective entry rate of 50 Bq.m-3.h-1 at an average indoor/outdoor temperature difference of 17K. The use of a simple averaging of winter/summer ratios for houses with varying radon 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 radon concentration in flats. Radiation Protection Dosimetry Radiation Protection Dosimetry Oxford University Press 59/1(1995-03-01), 33-42 0144-8420 59:1<33 1995 59 rpd https://doi.org/10.1093/oxfordjournals.rpd.a082634 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/oxfordjournals.rpd.a082634 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Arvela H. NATIONALLICENCE 773 0- Radiation Protection Dosimetry Oxford University Press 59/1(1995-03-01), 33-42 0144-8420 59:1<33 1995 59 rpd Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford