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在盐度突然变化的情况下,放射性核素在破碎的石灰中运输

Tuvia Turkeltaub¹, Noam Weisbrod¹, Mavrik Zavarin²

¹The Zuckerburg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev, Midreshet Ben Gurion 8499000, Israel.

The Science of the total environment

|November 19, 2023

概括

盐度的变化显著影响了和在破碎的粉笔中的流动性,这是一个潜在的核废物库. 较高的盐度会增加它们的移动,而较低的盐度会减少它们的移动,这对于仓库安全评估至关重要.

科学领域:

地质化学地质化学
水文地质学水文地质学
核废物管理核废物管理

背景情况:

地质储存库是核废物处理的商定解决方案.
,一种低透性的岩石,被研究为一种替代性宿主岩石,在传统选项无法使用的情况下.
在干旱地区的和变化的地下水盐度的裂可以影响放射性核素的运输.

研究的目的:

评估石灰作为放射性废物处理的宿主岩石的可行性.
为了研究季节性盐度变化的影响放射性核酸在破碎的石灰中的移动性.
了解 (U(VI), (Sr), (Ce) 和 (Re) 在变化的盐度条件下的行为.

主要方法:

实验使用自然破碎的石膏芯.
放射性U(VI) 和模拟剂标记剂 (Sr,Ce,Re) 的注射.
暴露于不同盐度溶液:人工雨水 (ARW) 和人工地下水 (AGW),加上反应式运输建模.

主要成果:

(Re) 作为一种保守的标记物表现,而 (Ce) 仅以合体形式表现出移动性,而两者都不受盐度变化的影响.
(U(VI)) 和 (Sr) 呈现出高盐度 (AGW) 的增加流动性和低盐度 (ARW) 的减少流动性.
性地下水溶液通过离子交换促进U和Sr的释放,增强它们在破碎的石灰中的迁移.

结论:

石灰作为储存器宿主岩石的适用性受到地下水盐度的影响.
地质储存库附近的盐度变化可以显著影响关键放射性核酸的移动性,如U和Sr.
在盐水条件下的离子交换过程是放射性核素在破碎的石灰中迁移的关键因素.

关键词:

碳酸盐岩石是一种碳酸盐岩石.(Cerium) 是一种有机物.离子强度强度离子强度放射性核酸是放射性核酸中的一种.反应性运输是一种反应性运输.斯特龙是一种.是一种.

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