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首页> 外文会议>Materials Science Technology Conference and Exhibition >INVESTIGATING ALTERATION OF PRE-VIKING HILLFORT GLASSES FROM THE BROBORG HILLFORT SITE, SWEDEN
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INVESTIGATING ALTERATION OF PRE-VIKING HILLFORT GLASSES FROM THE BROBORG HILLFORT SITE, SWEDEN

机译：从瑞典的Broborg Hillfort网站调查viking Hillfort眼镜的改变

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摘要

Radioactive waste, produced as a result of nuclear fission for power generation and weapons production, must be immobilized to limit radionuclide release into the biosphere over periods of many thousands of years. Several countries, including the United States, have chosen to vitrify nuclear waste materials prior to disposal. The solubility of ions in liquid, including if the liquid is super-cooled to a glass phase, is greater than in a corresponding crystalline solid; thus, radioactive ions are incorporated into a broad distribution of available sites in the glass structure, and the product is highly durable [1]. However, a glass phase is not thermodynamically stable and will, in principle, undergo some degree of alteration with time. Low level vitrified wastes will be disposed of in near surface sites, such as the Integrated Disposal Facility at the Hanford Nuclear Reservation, WA. Near-field solution chemistry, water diffusion, ion exchange, precipitation of mineral alteration phases, and microbial colonization could influence long-term glass performance, but not all of these parameters are currently captured in the modeling and performance assessments for low level nuclear waste glass disposal sites. Thus, robust models based on a mechanistic understanding of the processes responsible for glass degradation and radionuclide release in near surface environments are needed. These models will give confidence to performance assessments for nuclear waste disposal sites by predicting the durability of vitrified nuclear wastes over the course of thousands of years.
机译：放射性废物，如用于发电和武器生产核裂变而产生的，必须被固定到放射性核素释放限制进入生物圈过的几千年时间。一些国家，包括美国，都选择在处理前进行玻璃化的核废料。在液体离子，包括如果液体被过冷到玻璃相的溶解度，比在大的对应结晶固体;因此，放射性离子被掺入到玻璃中的结构可用的网站的宽分布，并且该产品是高度耐用的[1]。然而，玻璃相是热力学不稳定，并会在原则上，进行一定程度的改变随时间。低电平陶瓷废料将在近地表部位，如在汉福德核预订，WA综合处置设施进行处置。近场溶液化学，水扩散，离子交换，矿物蚀变阶段的沉淀和微生物的定植可能会影响长期的玻璃性能，但并非所有这些参数在建模和绩效评估为低水平核废料的玻璃正在拍摄处理场所处置。因此，需要基于在近地表环境负责玻璃降解和放射性核素释放的过程的机械理解可靠的模型。这些车型将在千百年的道路预测陶瓷核废料的耐久性给予信心绩效评估核废物处理场所处置。

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