摘要
目的:通过调查北京周边地区土壤中天然放射性核素^(226)Ra、^(232)Th和^(40)K的放射性活度浓度,估算其所致γ射线外照射剂量率,绘制北京周边地区γ射线外照射剂量率空间分布图。方法:用HPGeγ能谱仪测量土壤样品中^(226)Ra、^(232)Th和^(40)K的活度浓度,借助Arc GIS软件绘制土壤中天然放射性核素所致γ射线外照射剂量率空间分布图。结果:共采集和测量416份土壤样品,得到的γ射线外照射剂量率为26.9~94.2 nGy/h,平均值为62.0 nGy/h,北京周边大部分地区γ射线空气吸收剂量率水平在50.0~70.0 nGy/h之间。结论:绘制直观简单的北京周边地区土壤中天然放射性核素所致γ射线外照射剂量率分布图,对于评价和研究该区域环境放射性水平的变化具有重要意义。
Objective： To survey the activity concentrations of ^226Ra, ^232Th and ^40K in soil around Beijing, and to estimate gamma dose rate, then to draw the spatial distribution of gamma dose rate. Methods： The activity concentrations of ^226Ra, ^232Th and ^40K in soil samples were measured by HPGe γ spectrometry. The distribution of the gamma dose rate was drawn by Arc GIS software. Results： Four hundred and sixteen soil samples were collected and measured. The value of gamma dose rate was from 26.9 nGy/h to 94.2 nGy/h, with a mean of 62.0 nGy/h. The gamma dose rate of most regions around Beijing was between 50.0~70.0 nGy/h. Conclusion： Using simple and intuitive map to show the spatial distribution of gamma dose rate around Beijing is very important to evaluate and study the change of the regional radioactivity level.
出处
《中国医学装备》
2016年第1期67-69,共3页
China Medical Equipment
基金
国家重点基础研究发展计划973项目(2007CB407302)"重点区域水体和土壤环境的复合污染特征"
