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目的解铝矿区的土壤、室内外氡及γ辐射剂量率水平及其影响因素,为验证氡地质潜势规律提供依据。方法采用改进型ATD累积氡探测器、专业测氡仪和FH40G环境γ剂量率仪对铝矿区及周围环境氡浓度和γ剂量率进行了测量。结果铝矿工作区室外和室内γ照射量率均值分别是57.4和80.2 n Gyh-1;正在建设的工地为136n Gyh-1,明显高于已建好的工作区。厂区和工地土壤氡浓度分别为8864和29191 Bqm-3,工地为厂区的3.3倍,有2点超过30 000 Bqm-3。对照组德保县城土壤氡浓度有2点超过30 000 Bqm-3,占抽样总数的18.2%。矿区室外氡浓度最高点为41.6 Bqm-3,是我国室外典型值的2.97倍;室内氡浓度最高点为52.2 Bqm-3。发现德保县城室内氡浓度均值为55.9 Bqm-3(25.1~136 Bqm-3,n=25),为我国典型值的1.3倍。结论铝矿新开发工地γ剂量率和土壤氡浓度偏高,导致附近室外氡浓度有所增高。其他工作区和生活区天然辐射水平在正常本底范围。德保县城约有13.9%底层房屋中的氡浓度超过WHO(100 Bqm-3)推荐值,氡潜势区土壤氡对室内的贡献值得关注。
Objective To understand the levels of soil, indoor and outdoor radon and γ radiation dose rates and their influencing factors in the aluminum mining area, so as to provide evidences for verifying the geological potential of radon. Methods The radon concentration and γ dose rate of aluminum mine area and surrounding area were measured by the improved ATD cumulative radon detector, the professional radon detector and the FH40G environmental γ dose rate meter. Results The mean γ dose rate of outdoor and indoor workings of the aluminum mine was 57.4 and 80.2 n Gyh-1 respectively. The construction site under construction was 136 n Gyh-1, which was significantly higher than that of the constructed work area. The soil radon concentrations in the plant and construction sites were 8864 and 29191 Bqm-3, respectively, and the site was 3.3 times that of the plant site with 2 sites exceeding 30 000 Bqm-3. In the control group, the soil radon concentration in Dabao County exceeded 30 000 Bqm-3 at 2 o’clock, accounting for 18.2% of the total sample. The highest outdoor radon concentration was 41.6 Bqm-3, which is 2.97 times of the outdoor typical value in our country. The highest indoor radon concentration was 52.2 Bqm-3. The mean indoor radon concentration in Dabao County was 55.9 Bqm-3 (25.1-136 Bqm-3, n = 25), 1.3 times of the typical value in our country. Conclusion γ dose rate and soil radon concentration in newly developed aluminum mines are relatively high, resulting in the increase of outdoor radon concentration nearby. Other work areas and living area natural radiation levels in the normal context. About 13.9% of the ground-level buildings in the town of Debao County have a radon concentration exceeding the WHO (100 Bqm-3) recommendation, and the contribution of soil radon to the indoor area in the radon potential area is of concern.