| Ding Bowei,Wu Yunyun,Song Yanchao,et al.Research on radon exhalation rates from building materials of medium- and high-rise residential dwellings and their contribution to indoor radon concentrations[J].Chinese Journal of Radiological Medicine and Protection,2026,46(1):57-64 |
| Research on radon exhalation rates from building materials of medium- and high-rise residential dwellings and their contribution to indoor radon concentrations |
| Received:April 01, 2025 |
| DOI：10.3760/cma.j.cn112271-20250401-00115 |
| KeyWords:Medium- and high-rise dwellings Building materials Radon exhalation rate Indoor radon concentration Air exchange rate |
| FundProject:国家自然科学基金(12105274) |
| Author Name | Affiliation | | Ding Bowei | Key Laboratory of Radiological Protection and Nuclear Emergency, ChinaCDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Wu Yunyun | Key Laboratory of Radiological Protection and Nuclear Emergency, ChinaCDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Song Yanchao | Key Laboratory of Radiological Protection and Nuclear Emergency, ChinaCDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Hou Changsong | Key Laboratory of Radiological Protection and Nuclear Emergency, ChinaCDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Sun Haoran | Key Laboratory of Radiological Protection and Nuclear Emergency, ChinaCDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Cui Hongxing | Key Laboratory of Radiological Protection and Nuclear Emergency, ChinaCDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Shang Bing | Key Laboratory of Radiological Protection and Nuclear Emergency, ChinaCDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China |
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| Abstract:: |
| Objective To preliminarily explore the seasonal variation of radon exhalation rates from indoor building material surfaces within medium- and high-rise residential dwellings and their correlation with indoor and outdoor meteorological factors. Additionally, the contribution of radon exhalation from building materials to indoor radon levels is estimated using a model. Methods Totally 7 residential dwellings in Beijing and Harbin were selected. The radon exhalation rates from the building materials in dwellings were measured using the activated carbon method. Indoor radon concentrations were measured by using the RAD7 radon detector, and indoor air exchange rates were measured using the tracer gas dilution method. A model of the relationship between the radon exhalation rate from building material and indoor radon concentration was used to estimate the contribution of radon emitted from building materials to indoor radon levels. Results The average surface radon exhalation rates from interior walls, internal face of external wall, ceilings, and floors were 10.18, 10.57, 9.73, and 21.66 Bq·m-2·h-1 in 3 dwellings in Beijing, and 11.49, 11.61, and 15.73 Bq·m-2·h-1, in 4 dwellings from interior walls, internal face of external wall and cilings in Harbin. There were significant differences between the radon exhalation rates of the interior walls, internal face of external wall, ceilings, and floors across 7 buildings (F = 25.22, P<0.001), and the radon exhalation rate from floors was significantly higher than those from interior walls, internal face of external wall, and ceilings (P<0.001). There were no significant seasonal differences betweem the radon exhalation rates from internal face of external wall, interior walls, ceilings, and floors (P＞0.05). And the radon exhalation rate from internal face of external wall showed no correlation with indoor-outdoor temperature difference, pressure difference, or humidity difference (P>0.05). The average indoor air exchange rate was 0.20 h-1, and the average contribution of radon exhalation from building materials to indoor radon levels was 72%±15%. Conclusions Radon exhalation from building materials is the primary source of indoor radon in medium- and high-rise dwellings. The accumulated radon exhalation rates from indoor building materials are less affected by seasonal variations and outdoor meteorological factors. |
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