| 3H和99Tc在黄土中的迁移特性比较 |
| 摘要点击 1343 全文点击 950 投稿时间：2002-11-23 修订日期：2003-03-11 |
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| 中文关键词 黄土 99Tc 3H 包气带 含水层 数值模拟 |
| 英文关键词 loess 99Tc 3H aerated zone aquifer numerical simulation |
| 作者 | 单位 | | 王金生 | 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 | | 郭敏丽 | 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 | | 刘春立 | 北京大学化学与分子工程学院,北京,100871 | | 李书绅 | 中国辐射防护研究院,太原,030006 |
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| 中文摘要 |
| 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. |
| 英文摘要 |
| 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 0.05～0.055mL/g in the aerated zone, 3H distribution coefficient is 0.116mL/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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