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首页> 外文期刊>Environmental Science & Technology >Mobility of Radionuclides in Fractured Carbonate Rocks: Lessons from a Field-Scale Transport Experiment
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Mobility of Radionuclides in Fractured Carbonate Rocks: Lessons from a Field-Scale Transport Experiment

机译：放射性核素在裂缝碳酸盐岩中的流动性：场级运输实验的课程

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摘要

Current research on radionuclide disposal is mostly conducted in granite, clay, saltstone, or volcanic tuff formations. These rock types are not always available to host a geological repository in every nuclear waste-generating country, but carbonate rocks may serve as a potential alternative. To assess their feasibility, a forced gradient cross-borehole tracer experiment was conducted in a saturated fractured chalk formation. The mobility of stable Sr and Cs (as analogs for their radioactive counterparts), Ce (an actinide analog), Re (a Tc analog), bentonite particles, and fluorescent dye tracers through the flow path was analyzed. The migration of each of these radionuclide analogs (RAs) was shown to be dependent upon their chemical speciation in solution, their interactions with bentonite, and their sorption potential to the chalk rock matrix. The brackish groundwater resulted in flocculation and immobilization of most particulate RAs. Nevertheless, the high permeability of the fracture system allowed for fast overall transport times of all aqueous RAs investigated. This study suggests that the geochemical properties of carbonate rocks may provide suitable conditions for certain types of radionuclide storage (in particular, brackish, high-porosity, and low-permeability chalks). Nevertheless, careful consideration should be given to high-permeability fracture networks that may result in high radionuclide mobility.
机译：目前关于放射性核素处理的研究主要是在花岗岩，粘土，盐石或火山凝灰岩形成中进行的。这些岩石类型并不总是可用于在每个核废物发电国家举办地质存储库，但碳酸盐岩可以作为潜在的替代品。为了评估其可行性，在饱和骨折的粉笔形成中进行强制梯度交叉钻孔示踪实验。分析了稳定Sr和Cs（作为其放射性物体的类似物）的迁移率（作为其放射性物体的类似物），Ce（致动碱肽类似物），Re（ATC类似物），膨润土颗粒和通过流动路径的荧光染料示踪剂进行了分析。这些放射性核素类似物（Ras）的迁移显示依赖于它们的溶液中的化学物质，它们与膨润土的相互作用以及它们对粉末岩石基质的吸附潜力。咸水地下水导致絮凝和固定大多数颗粒Ras。然而，骨折系统的高渗透性允许所有含水RAS的快速整体运输时间进行研究。该研究表明碳酸盐岩石的地球化学性能可以为某些类型的放射性核素储存（特别是咸巧克力，高孔隙率和低渗透性粉笔）提供合适的条件。尽管如此，应仔细考虑可能导致高放射性核素迁移率的高渗透性骨折网络。

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  • 来源
    《Environmental Science & Technology》 |2020年第18期|11249-11257|共9页
  • 作者

    Emily L. Tran; Paul Reimus; Ofra Klein-BenDavid; Nadya Teutsch; Mavrik Zavarin; Annie B. Kersting; Noam Weisbrod;

  • 作者单位

    Zuckerberg Institute for Water Research Jacob Blaustein Institutes for Desert Research Ben Gurion University of the Negev Midreshet Ben Gurion 8499000 Israel;

    Los Alamos National Laboratory Los Alamos New Mexico 87545 United States;

    Nuclear Research Center of the Negev Negev Beersheva 8419001 Israel Geological and Environmental Science Department Ben Gurion University of the Negev Beersheva 8410501 Israel;

    Geological Survey of Israel Jerusalem 9371234 Israel;

    Lawrence Livermore National Laboratory Livermore California 94550 United States;

    Lawrence Livermore National Laboratory Livermore California 94550 United States;

    Zuckerberg institute for Water Research Jacob Blaustein Institutes for Desert Research Ben Gurion University of the Negev Midreshet Ben Gurion 8499000 Israel;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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