作　　者： ; (陈智营）;

机构地区： 广州师范学院环境应用化学研究所

出　　处： 《中国环境科学》 1999年第1期91-96,共6页

摘　　要： 对广东省下庄和南雄两个铀矿区的大气氡环境地球化学进行了研究．矿区废渣和坑道口释放出来的氡气对周围大气形成了氡污染，特别是在矿区周围１～２ｋｍ范围内的污染严重．但是空气中的氡污染随着离矿区的距离增大而迅速减弱．矿区周围居民室内氡的浓度高，是广东省室内氡浓度平均值的７～８倍左右．在进行调查的２９个居室中，有９个（３１％）居室内氡浓度超过美国环境保护局制定的０．１５Ｂｑ／Ｌ室内氡浓度的上限值．居室中氡浓度的升高，除了受矿区释放出来的氡污染外，还因为本地区属高本底辐射区，房基下的土壤、岩石和建筑材料中的铀、镭等放射性元素的含量高，其放射性衰变产生的氡释放出来进入室内． According to the research of radon environmental geochemistry in two uranium deposit areas, Xiazhuang and Nanxiong ,North Guangdong Province, it showed that the air in the range of 1～2km around these areas were seriously contaminated by the radon releasing from the process of uranium exploration and mining;but the contamination level of radon rapidly reduced with the increase of the distance from these areas.The indoor radon concentration of inhabitant around these areas is high, about 7～8 times of the average value of Guangdong. In all the 29 dwellings surveyed,there are 9 dwellings (31%) which have indoor radon levels above 0.15Bq/L, a limit value of indoor radon laid down by U.S. Environmental Protection Agency. The main reason of high level indoor radon concentration is that these areas belong to high background radiation area, so the soil and rocks in house basement have high content of U and Ra with an amount of radon produced,releasing and entering the dwellings.

关 键 词： 铀矿区 大气环境 氡浓度 环境地球化学 广东

领　　域： [环境科学与工程] [环境科学与工程]