Radon gas is one of the most influential sources of indoor exposure. All its physical properties together make it a significant risk factor for lung cancer in the population. The research aims are outlined as (1) to measure the radon concentration in Tehran city and compare results with the international standards (2) to determine spatial distribution of radon gas concentration using Geographical Information System (GIS) software and (3) to estimate the annual effective dose and potential risk of lung cancer by radon-222 in Tehran city. In this study, 800 Alpha Track detectors were installed in houses in 22 regions of Tehran city and retrieved after 3 months. The measurements were repeated for spring and summer and autumn seasons. The annual effective dose and risk of lung cancer were assessed using standard equations. Data were analyzed using SPSS 20. Result showed the minimum and maximum radon concentration were observed in and Ghalee-kobra (0.13 Bq.m⁻³) and Charbagh-ponak district (661.11 Bq.m⁻³) respectively. There was no observed relationship between radon concentration and houses’ model, cracking condition and constructionn materials. Expectedly, the storehouses and basements had significantly higher (P = 0.016) radon concentration than occupied rooms. The min and max of the estimated annual effective dose were 0.65 and 2.03 mSv, respectively. Result showed that around 5% of the sampling sites had higher level of radon than the maximum allowed by EPA. A rough estimation of the expected radon-attributed lung cancer incidences yielded approximately 5958 cases in the total population of Tehran every year. In view of the growing trend in cancer incidences, appropriate measures addressing radon should be undertaken in areas of increased exposure to this noble gas.

中文翻译：

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使用地理信息系统评估伊朗德黑兰22个地区的年度有效剂量并增加由内部internal 222引起的肺癌风险。

gas气是室内暴露最有影响的来源之一。它所有的物理特性使其成为人群中肺癌的重要危险因素。研究目标概述为（1）测量德黑兰市的don气浓度，并将结果与​​国际标准进行比较（2）使用地理信息系统（GIS）软件确定ra气浓度的空间分布，以及（3）估算德黑兰市的radon-222致年度有效剂量和潜在的肺癌风险。在这项研究中，在德黑兰市22个地区的房屋中安装了800台Alpha Track探测器，并在3个月后收回。对春季，夏季和秋季进行重复测量。使用标准方程式评估年度有效剂量和肺癌风险。^-3）和Charbagh-ponak区（661.11 Bq.m ^-3）。observed浓度与房屋模型，开裂条件和建筑材料之间没有观察到关系。可以预期，仓库和地下室的数量要高得多（P = 0.016）occupied浓度高于占用的房间。估计的年度有效剂量的最小值和最大值分别为0.65和2.03 mSv。结果表明，大约5％的采样点的had水平高于EPA允许的最高水平。粗略估计预期的由ra引起的肺癌发生率，每年在德黑兰的总人口中大约产生5958例。鉴于癌症发病率的增长趋势，应在增加接触这种稀有气体的区域中采取适当的应对ra措施。