【作者】 苏世标； 杨鲁静； 张卫； 苏衍春； 余龙； 童建；

【Author】 Su Shi-biao, Yang Lu-jing, Zhang Wei, Su Yan-chun, Yu Long, Tong Jian(School of Radiation and Public Health, Suzhou University,Jiangsu,Suzhou,215007)

【机构】 苏州大学放射医学与公共卫生学院； 抚州铀矿；

【摘要】 [目的] 了解某铀矿井下氡及子体在10年间不同年份、不同季节、不同工种的分布规律,以便针对性采取井下降氡措施。[方法]收集1995-2004年间某铀矿井下氡及子体浓度资料,计算平衡当量氡浓度及平衡因子F。[结果]①主要工作面(一类)的氡及子体浓度均高于辅助工作面(二类)(P<0.01),未通风时的浓度明显高于通风时(P<0.01)。②铀矿井下氡及子体浓度在夏、秋季比春、冬季高,5月和9月的水平接近年平均水平。③在主要工作面出碴、出矿、打钻和支柱作业点处氡及子体浓度较高。④导出铀矿井下空气中年平均氡浓度为2977 Bq/m3,测定样品中超过年平均浓度的占26%,平均平衡因子F=0.34。[结论]①通风目前是降低氡及其子体浓度的有效方法。②5月和9月是调查铀矿井下氡及子体平均辐射水平的最佳季节。更多还原

【Abstract】 [Objective] To analyse the variations of radon and its daughters’ concentrations in ten years in a uranium well so that we can aim directly at lowering radon and its daughters’ concentrations. [Methods[ The monitoring data of radon and its daughters from 1995 to 2004 are used to calculate its equilibrium equivalent concentration (Ceq) and its equilibrium factor. [Results] (1)Radon and its daughters’ concentrations in the air of the main work place is higher than those of the assistant work place (P<0.01) , in autumn and summer than those in spring and winter and in the work types such as mining, drilling, and raking than in thers. (2)The annual average radon concentration was 2977Bq/m3,with 26 percent of the sample over the average. The equilibrium factor was calculated as 0.34. There was a significant difference between ventilation and nulli-ventilation (P<0.01). [Conclusions] (1)Ventilation is an effective way to lower radon and its daughters concentration. (2)Their concentrations in May and September can be representative of the annual average radiation level of radon and its daughters.更多还原