| 许明发,林晨,贾力博,常青,向辉云,于慧君.南宁市某办公室内氡平衡因子变化规律研究[J].中华放射医学与防护杂志,2022,42(8):636-640 |
| 南宁市某办公室内氡平衡因子变化规律研究 |
| Levels and variation of radon equilibrium factor in an office of Nanning city |
| 投稿时间：2021-12-20 |
| DOI：10.3760/cma.j.cn112271-20211220-00487 |
| 中文关键词: 氡浓度 平衡当量氡浓度 平衡因子 连续测量 |
| 英文关键词:Radon concentration Equilibrium equivalent radon concentration Equilibrium factor Continuous measurement |
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| 中文摘要: |
| 目的 研究室内环境中氡平衡因子数值水平和变化范围。方法 在南宁市某室内工作场所中，开展了为期1年的氡浓度和平衡当量氡浓度同地点同时连续测量，氡气体和氡子体有效数据获取率分别为99.9%和86.7%。结果 测量结果表明，该室内环境中，氡年平均活度浓度和平衡当量氡浓度分别为（50.9±20.7）和（15.5±10.1） Bq/m3，二者均观测到了一致的日变化和季节性变化规律；平衡因子年均值为0.30±0.12，没有观测到日变化规律，但发现平衡因子月均值的年分布同氡浓度及氡子体浓度分布趋势类似，最高值和最低值出现在11月和6月，分别为0.47±0.24和0.19±0.06。结论 平衡因子月均值的波动，推测是不同季节室内通风状态不同导致。该结果提示，基于氡气体浓度估算氡暴露年有效剂量时，平衡因子取值有可能带来较大的不确定度，应该谨慎。 |
| 英文摘要: |
| Objective To study the levels and variation of equilibrium factor in indoor environment.Methods A one-year continuous measurement of radon concentration and equilibrium equivalent radon concentration was carried out in an indoor office building of Nanning city. The effective data acquisition rates of radon gas and radon progeny were 99.9% and 86.7%, respectively.Results The annual average activity concentration and equilibrium equivalent radon concentration in indoor environment were (50.9±20.7)and (15.5±10.1)Bq/m3, both of which had the same diurnal and seasonal variation. The average annual value of equilibrium factor was 0.30±0.12, showing no obvious diurnal variation. The distribution of monthly mean value of equilibrium factor showed a similar trend to that of radon and radon progeny. The highest and the lowest value appeared in November and June, respectively, with 0.47±0.24 and 0.19±0.06.Conclusions Due to the large variation range of monthly mean value of equilibrium factor in indoor environment, when annual effective dose of radon exposure was estimated based on radon gas concentration, attention should be paid to choose the quantity value of equilibrium factor and the uncertainty caused by the change of equilibrium factor should be considered. |
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