en Radiation Biology Radiation Biology تحقيق بديع Original Research <p><strong>Background:</strong> In Iran, architectures are often unaware of the risk of radon inhalation and how to reduce radon levels. Furthermore, radon considerations are not implemented in construction methods, construction materials and building utilization by regulatory authorities. <strong>Materials and Methods:</strong> In this study after reviewing the meteorological changes of Ramsar over the past 50 years (1955-2005), a novel design for constructing dwellings in radon prone areas is introduced. Out of building interventions such as planting wind-tunnel-making trees will be discussed in another paper. Ramsar soil samples with 4 levels of specific activities (extremely hot, severely hot, very hot, and hot) were placed in a model house. Radon level monitoring was performed by using a PRASSI portable radon gas survey meter. <strong>Results:</strong> For extremely hot soil samples, the radon levels inside the model house when windows were closed for 24 hours were 1615 &plusmn;516 Bq/m3. When windows which were in the wind direction or opposite the wind direction were opened for 24 h, the radon level decreased to 89 &plusmn;286 and 139 &plusmn;314 Bq/m3, respectively. Interestingly, when crossed windows were opened for the same duration, Radon level was 144 &plusmn;92 Bq/m3. In cold seasons, when windows are usually closed, Chimney effect reduced the radon level to 323&plusmn;641. For severely hot, very hot and hot soil samples, natural ventilation-based interventions effectively reduced the radon level. <strong>Conclusion:</strong> Results obtained in this study clearly show that natural ventilation-based simple cost-effective interventions can significantly reduce the radon concentration in radon prone areas of Ramsar.</p> Radon, Ramsar, natural ventilation, house design, dwellings 69 74 http://ijrr.com/browse.php?a_code=A-10-1-491&slc_lang=en&sid=1 L.A. Mehdipour 790031947532846007698 790031947532846007698 No Department of Physics, Faculty of Science, University Putra Malaysia, Malaysia S.M.J. Mortazavi mmortazavi@sums.ac.ir 790031947532846007699 790031947532846007699 Yes Department of Medical Physics and Medical Engineering, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran E.B. Saion 790031947532846007700 790031947532846007700 No Department of Physics, Faculty of Science, University Putra Malaysia, Malaysia H. Mozdarani 790031947532846007701 790031947532846007701 No Department of Medical Genetics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran S.A. Aziz 790031947532846007702 790031947532846007702 No Department of Physics, Faculty of Science, University Putra Malaysia, Malaysia H.M. Kamari 790031947532846007703 790031947532846007703 No Department of Physics, Faculty of Science, University Putra Malaysia, Malaysia R. Faghihi 790031947532846007704 790031947532846007704 No Radiation Research Center, Mechanical Engineering School, Shiraz University, Shiraz, Iran S. Mehdizadeh 790031947532846007705 790031947532846007705 No Radiation Research Center, Mechanical Engineering School, Shiraz University, Shiraz, Iran M.R. Kardan 790031947532846007706 790031947532846007706 No National Radiation Protection Department, Iranian Nuclear Regulatory Authority, Tehran, Iran A. Mortazavi 790031947532846007707 790031947532846007707 No Department of Architecture, Beiza Branch, Islamic Azad University, Beiza, Iran