电池电镀化工厂周边土壤中放射性核素的种类与分布关系
毕业论文关键词 土壤污染 化工污染 放射性核素 比活度 富集因子
Title The Types And Distribution Relationship Of The Radionuclide In The Soil Around The Battery and Galvanization Plant
Abstract At this stage, the raw materials of the chemical production contain radioactive nuclide, and the chemical production has a large pollutant emissions. Consequently, there is a lot of radionuclide contaminated soil surrounding the chemical plant. This article studies the types and distribution relationship of radioactive nuclides in chemical plant surrounding soil. In this research, we collected soil samples and put them in the high purity germanium semiconductor detector to measure the types and levels of the nuclides. We connect the value of specific activity of different distance from the plant and make a fitting curve of the specific activity, we found that the specific activity of 232Th, 214Bi, 214Pb, 212Pb decreased with the increasing distance from the plant. The specific activity form an approximate linear decline, it indicates the concentration of the radioactive nuclide decreased with the increase of the distance from the plant. The relation between the specific activity of 40K and the distance from plant is not big, it has a strong randomness. The enrichment factor of the 214Bi, 214Pb, 212Pb are basically bigger than 1.5 in every samples within 100 metres from the plant. Consequently, the soil that surrounding the factory has radioactive nuclide concentration and the concentration reduce near to linear with the increasing distance. This paper analyzes the types and enrichment condition of the radionuclide in soil detailedly, it has a good reference for related research.
Keywords soil pollution chemical industrial pollution radionuclides specific activity enrichment factor
目次
1绪论1
1.1课题研究背景1
1.2国内外相关课题的研究进展2
2实验部分6
2.1土壤样品的采集和处理6
2.1.1采样6
2.1.2采样点的布设6
2.1.3研究区域概况7
2.1.4样品处理7
2.2土壤样品的γ能谱测量与数据分析7
2.2.1实验所关注的核素8
2.2.2测量步骤8
2.2.3比活度和富集因子计算方法和公式8
3结果与讨论10
3.1璞瑞电池厂周围土壤放射性核素的测量分析10
3.2双登电池厂周围土壤放射性核素的测量分析11
3.3泰通电镀厂周围土壤放射性核素的测量分析13
3.4各放射性核素富集因子15
结论18
致谢19
参考文献20