鄂尔多斯典型煤矿周围土壤及石煤放射性核素含量调查分析

Investigation and Analysis of Radioactive Nuclide Content in Soil and Coal Around a Typical Coal Mine in Ordos

通过采样点预设,采集分析鄂尔多斯典型煤矿周围土壤及石煤样品,获得了^(238)U、^(232)Th、^(226)Ra、^(40)K、^(137)Cs等放射性核素含量。利用绘图软件插值绘图研究矿区周围放射性核素分布情况,计算年有效剂量、镭当量、内外照射危害因子、终身致癌风险等指标进行环境健康风险评估。结果表明:除部分土壤(13号、20号土壤样品)中^(238)U、^(40)K含量超出我国平均值外,其余放射性核素含量均在我国规定范围内;在不同矿区石煤样品中所测量的放射性核素含量均在我国规定范围内,不属于高本底地区。

Pre-set sampling points were utilized to collect and analyze soil and coal samples around a typical coal mine in Ordos.The contents of radioactive nuclides such as ^(238)U,^(232)Th,^(226)Ra,^(4)0K,^(137)Cs were determined.Interpo-lation mapping was conducted using graphic software to study the distribution of radioactive nuclides around the mining area.Additionally,environmental health risk assessments were performed by calculating the annual effective dose,radium equivalent,internal and external hazard indices,and lifetime cancer risk.The results indicated that ex-cept for elevated levels(in soil samples 13 and 20)of ^(238)U and ^(40)K,which exceeded the national average,the con-tents of other radioactive nuclides were within the national standards.The radioactive nuclides measured in the coal samples from various mining areas were also within the prescribed limits,indicating that these areas do not belong to regions with high natural background radiation.