广东中山地区土壤氡浓度填图研究

摘要

为了研究区域土壤氡填图的方法,利用RAD7电子测氡仪和RADON-JOK土壤气体渗透率仪在广东省中山市进行了面积为1 800 km2的测量工作,有效测点数为67个.中山市的平均土壤氡浓度为(100.41±154.64) kBq/m3；最大值和最小值分别为0.74 kBq/m3和1 199.24 kBq/m3.土壤气体渗透率测量结果表明,在风化花岗岩地区,高渗透率和中渗透率占优势；而第四纪沉积物地区大部分土壤气体渗透率较低.基于此,结合研究区土壤氡浓度和土壤气体渗透率,对研究区土壤氡风险进行了分级评价.为土壤氡风险分级的方法研究提供了有参考价值的研究实例.%In order to study the regional mapping method of radon concentration in soils, the survey work was performed in a total survey area of 1 ,800 km2 in Zhongshan, Guangdong Province. The electronic radon monitor RAD7 and the permeameter RADON-JOK were used to measure radon-222 concentration and gas permeability of soils, acquiring 67 valid data. The radon-222 concentrations of soils in Zhongshan vary between 0. 74 kBq/m3 and 1 ,199. 24 kBq/m3, and the average concentration is (100. 41 ± 154. 64) kBq/m3. The gas permeability of the weathered granite soil is dominantly high and medium, and that of most Quaternary sediments is low. Based on these data, the radon risk of soils in the study area is accurately classified, and the result shows that the classification method of radon risk of soil based on the radon concentration and gas permeability is proved to be feasible.