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773115293新虫 (著名写手)
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| Compacted bentonite has been chosen as the backfill material a high level nuclear waste repository (HLW). It has large sorption capability, low permeability and good sealing effect by swelling [1]. Diffusion processes of radionuclides in compacted bentonite are a good way to simulate radionuclide transport from the spent fuel to the environment around the repository in order to understand radionuclides interaction with bentonite. 79Se and 99Tc have received more attention because they are identified to be among the largest contributors to the performance associated with HLW. Previous researches have been carried out a lot of Se and Tc diffusion experiments [2, 3]. Research found that apparent diffusion coefficient Da values for HSe- are one order of magnitude smaller than those for SeO32- [4]. Capillary method study 99TcO4- diffusion in compacted bentonite from Gaomiaozi County found that Kd values from capillary teats are lower than those from batch tests and Kd is a strong function of dry density of the compacted bentonite [3]. |
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nono2009: 金币-100, 屏蔽内容, 违规存档, 违规广告 2015-10-28 22:25:48
nono2009: 金币-100, 屏蔽内容, 违规存档, 违规广告 2015-10-28 22:25:48
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2楼2015-10-12 15:10:46
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773115293: 金币+20, 翻译EPI+1, ★★★★★最佳答案 2015-10-13 13:17:39
773115293: 金币+20, 翻译EPI+1, ★★★★★最佳答案 2015-10-13 13:17:39
| 压实膨润土作为高水平放射性核废料处置库的回填材料（HLW）。其膨胀后[ 1 ]具有较大的吸附性能、低渗透性和良好的密封性。放射性核素在压实膨润土中的从扩散过程可以很好地模拟放射性核素从乏燃料迁移到周围的环境的过程，以了解放射性核素迁移与膨润土的关系。79Se和99Tc因被确定为HLW性能的最大贡献者之一受到了更多的关注。前人的研究已经进行了大量的硒和胆固醇的扩散实验[ 2，3 ]。研究发现，HSE的表观扩散系数Da值比SeO32-小了一个数量级[ 4 ]。毛细管法研究在高庙子县膨润土中的99TcO4-的扩散发现从毛细管试验所得的Kd值低于批量测试，Kd是压实膨润土的干密度函数扩散的一个重要指标[ 3 ]。 |
3楼2015-10-13 09:12:29
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