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在水平组件中的迁移试验是核素在含水层迁移试验的重要组成部分。本文主要介绍在中国辐射防护研究院野外试验场地下研究设施 (URF)试验竖井中进行的水平组件试验的方法和结果。水平组件中装有示踪剂和在含水层采集的未扰动土壤 ,通过试验竖井壁水平插入含水层 ,天然地下水通过与含水层介质紧密相连的一端流过组件 ,在接取样管的另一端接取水样 ;通过测量试验期间采集的水样和试验结束后切割的土壤样品中示踪剂的浓度 ,得到核素的迁移数据。试验结果表明 ,黄土对试验所用的90 Sr、2 3 7Np、2 3 8Pu和 2 41Am以及 Sr、Nd和 Ce都有较强或很强的吸附能力 ;核素迁移具有偏心现象 ;腐殖酸延缓了 90 Sr的迁移 ;3 H的迁移速度慢于 Br-。
Migration testing in horizontal components is an important part of the nuclide migration test in aquifers. This paper mainly introduces the methods and results of the horizontal component tests carried out in the URF test shaft of the Institute of Radiation Protection of the China Radiation Protection Research Institute. The horizontal component contains a tracer and undisturbed soil collected in the aquifer through which horizontal aquifer is inserted through the test shaft wall. The natural groundwater flows through the module through one end of the aquifer medium in close contact with the other end of the sample tube Water samples were taken; nuclide migration data were obtained by measuring the water sample collected during the test and the concentration of the tracer in the cut soil samples after the test. The experimental results show that loess has strong or strong adsorption capacity for 90 Sr, 2 3 7Np, 2 3 8Pu and 2 41Am as well as Sr, Nd and Ce used in the experiment; the migration of nuclei is eccentric; the humic retardation 90 Sr migration; 3 H migration slower than Br-.