| Deng Jun,Cao Lei,Zhang Qingzhao,Lian Dexing,Shang Bing,Su Xu.Calculation and analysis of effect of radon exhalation on external dose model for building materials[J].Chinese Journal of Radiological Medicine and Protection,2014,34(2):140-144 |
| Calculation and analysis of effect of radon exhalation on external dose model for building materials |
| Received:May 09, 2013 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.02.016 |
| KeyWords:Radon exhalation Building material External dose model Radon surface emanation factor |
| FundProject: |
| Author Name | Affiliation | E-mail | | Deng Jun | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Cao Lei | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Zhang Qingzhao | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Lian Dexing | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, 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, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Su Xu | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | suxu@nirp.cn |
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| Abstract:: |
| Objective To study the effect of radon exhalation on the external dose model for building material, so as to provide the scientific and precise assessment of external radiation exposure hazard. Methods The mechanism of exhalation of radon from building material was analyzed, mathematical model of correction factor for the effect of radon exhalation was derived and resolved by Matlab program and the relationship between correction factor and diffusion length, surface emanation coefficient and thickness of building material was discussed. The absorbed dose rate induced by several classical building materials was calculated and compared. Results The radon exhalation correction factor was independent of diffusion length and thickness of building material in most cases. Negative correlation was found between radon exhalation correction factor and radon surface emanation coefficient. Radon exhalation correction factor numerically equals to‘1-radon surface emanation coefficient’. The relative percentage deviation between absorbed dose rate induced by several classical building materials was in the range of 2.23%-10.02%, for both corrected and uncorrected radon exhalation effects. Conclusions Radon exhalation from building material has a certain effect on external dose model for building material,which should attract attention. It is important to conduct the correction for external dose model by introducing‘1－radon surface emanation coefficient’ as the radon exhalation correction factor, in order for the scientific assessment and control of external radiation exposure hazards from building materials. |
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