为降低国民肺癌疾病负担、提高生活空间空气质量，选择新疆乌鲁木齐市为试验区，开展高氡潜势风险区室内氡污染源的来源及分布研究。通过比较伽马能谱数据和土壤气体中组合氡浓度和土壤透气性的氡潜势图的分布特征，研究氡潜势多元统计模型的适用性，以及西部干旱或半干旱地区氡潜势分类值的修正因子。基于空间地质和氡潜势分布信息，研究贝叶斯方法遴选室内氡调查点方法。在室内氡异常区域开展室内氡、现场伽马能谱、氡析出率和伽马剂量率的长期连续联合观测，深入研究室内氡浓度和土壤与建材中镭含量、氡析出率、空气换气率，气象和介质物性参数的关联性。研究钍射气及其子体对实测氡浓度结果的影响。探索甄别氡污染源的方法，研究氡污染源与建筑材料、饮用水等介质中铀、镭等核素比活度的关系，研究氡污染源的来源及分布。本项目研究成果将进一步完善氡潜势填图方法，为已有氡问题的房屋采取治理行动提供科学依据，在辐射防护、生态环境保护等领域有应用前景。

In order to reduce the burden of lung cancer disease and improve the quality of living space in China, Urumqi City, a typical western region, was selected as the experimental area to study the source and distribution of indoor radon contamination sources in the high radon potential risk area. By comparing the distribution characteristics of the radon potential map based on the data of gamma-ray spectrometry and combined radon concentration in soil gas and gas permeability of soil, the applicability of the existing radon potential multivariate statistical model will be studied, as well as the correction factor for the radon potential classification value in the arid or semi-arid regions of western China. Based on the information of spatial geology and radon potential distribution, the Bayesian method will be used to select sites for indoor radon survey. Long-term continuous joint observations of indoor radon, in-situ gamma ray spectrometry, radon exhalation rate and gamma dose rate will conducted in the indoor radon anomalous areas. The relationship between indoor radon concentration, radium content in soil and building materials, radon exhalation rate, air exchange rate, and parameters of meteorological and media physical properties will be also studied. The effect of thoron and its daughters on the measured indoor radon concentration results will be studied. Exploring the methods of screening for contamination sources in anomalous houses, studying the relationship between the pollution source and the specific activity of radionuclides such as uranium and radium in building materials and drinking water, and then studying the source and distribution of the radon sources. The research results of this project will further improve the radon potential mapping method, provide scientific basis for the treatment of existing radon contamination houses, and have application prospects in radiation protection, ecological environment protection and other fields.