| 3H和99Tc在黄土中的迁移特性比较 |
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| 引用本文： | 王金生,郭敏丽,刘春立,李书绅. 3H和99Tc在黄土中的迁移特性比较[J]. 环境科学, 2003, 24(6): 48-53 |
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| 作者姓名： | 王金生 郭敏丽 刘春立 李书绅 |
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| 作者单位： | 北京师范大学环境科学研究所地下水科学与工程研究中心,环境模拟与污染控制国家重点联合实验室,北京,100875;北京师范大学环境科学研究所地下水科学与工程研究中心,环境模拟与污染控制国家重点联合实验室,北京,100875;北京大学化学与分子工程学院,北京,100871;中国辐射防护研究院,太原,030006 |
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| 基金项目： | 国家自然科学基金资助项目;水利部黄河水利委员会资助项目(50239010);国家重点基础研究发展规划项目(G1999043606) |
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| 摘 要： | 3H和99Tc是低中放废物处置中2个重要的核素,在处置场的安全评价中十分重要.由于介质对3H和99Tc的吸附较弱,常忽略其滞留性,并用3H标定地下水的流速.野外实验表明:在包气带中,黄土对99Tc的吸附大于3H;在含水层中,黄土对3H迁移的影响大于99Tc.本文根据实验数据,采用非平衡吸附模式NESOR程序分别模拟了3H和99Tc在黄土包气带和含水层中的迁移过程.模拟结果表明:99Tc在黄土包气带中的分配系数范围为0.05～0.055mL/g;3H在黄土含水层中分配系数为0.116mL/g,该参数是黄土对3H和99Tc综合影响的结果,其滞留机理尚待研究.
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| 关 键 词： | 黄土 99Tc 3H 包气带 含水层 数值模拟 |
| 文章编号： | 0250-3301(2003)06-06-0048 |
| 收稿时间： | 2002-11-23 |
| 修稿时间： | 2002-11-23 |
Comparison of Migration Characteristic of 3H and 99Tc in Loess |
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| Wang Jinsheng,Guo Minli,Liu Chunli and Li Shushen. Comparison of Migration Characteristic of 3H and 99Tc in Loess[J]. Chinese Journal of Environmental Science, 2003, 24(6): 48-53 |
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| Authors: | Wang Jinsheng Guo Minli Liu Chunli Li Shushen |
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| Affiliation: | State Key Joint Laboratory of Environmental Simulation and Pollution Control, Institute of Environmental Sciences, Beijing Normal University, Beijing 100875, China. |
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| Abstract: | 3H and 99Tc are important nuclides in low and intermediate level radioactive wastes, and in safety assessment of near surface repository their migration characteristic usually determines the computing result. The medium of loess appears to possess the characteristic of weak adsorption ability to 3H and 99Tc when they are migrating in it, so the adsorption ability are often neglected, and 3H are used to identify groundwater velocity. But in the field test it was showed that in the aerated zone loess possesses stronger adsorption ability to 99Tc than to 3H, and in the aquifer the stronger adsorption ability to 3H than to 99Tc. In this paper the migration tests of 3H and 99Tc were simulated by NESOR program of non-equilibrium adsorption model. The results show: 99Tc distribution coefficient ranges 0.05-0.055 mL/g in the aerated zone, 3H distribution coefficient is 0.116 mL/g in the aquifer, and the parameter reflects integrated impact of loess on 3H and 99Tc, and the mechanism of them being retarded still need proving. |
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| Keywords: | loess 99Tc 3H aerated zone aquifer numerical simulation |
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