采用高纯锗(HPGe)γ谱仪分析测定某铀尾矿库周边农田土壤样品中~(137)Cs的含量,研究农田土壤中放射性核素~(137)Cs的分布特征。结果表明,研究区尾矿库周边农田~(137)Cs的表层至地下1m处含量大多在农田边缘地区含量最高,在农田中心地区含量最低;~(137)Cs主要分布在土壤表层,在1m范围内随着深度增加含量减少;研究区农田植物、土壤对~(137)Cs的吸附有影响,~(137)Cs在垂直方向含量的规律不明显,这可能与土壤粒径大小、土壤pH、研究区域降水量以及与尾矿库水平距离相关。
137Cs contents in farmland soil samples around tails pond of uranium mine were measured and analyzed by High Purity Germanium (HPGe) y Spectrometer to investigate distribution characteristics of radionuclide 137 Cs. The results show that content of 137 Cs is highest in marginal area of farmland, while is lowest in central area of farmland. 137Cs mainly distributes in surface soil, and content of 137Cs drops within range of 1 m. Soils in study area affect adsorption of 137Cs, and content of 137Cs is unstable in vertical direction, due to particle size and pH value of soil, local precipitation, and horizontal distance to uranium railings pond.