Efficient porous adsorbents are crucial for: the mitigation of radioxenon emissions from nuclear installations, the production of Xe and the detection of clandestine nuclear weapon tests. Silver-exchanged zeolites or alike, specifically Ag-ZSM-5 and Ag-ETS-10, are promising candidates for these applications. However, knowledge on their radiation resistance is lacking and further research is necessary on their durability against thermal regeneration cycles. The radiation resistance was investigated for the first time by in situ irradiation with Xe up to about 100 MGy on Ag-ETS-10 and Ag-ZSM-5. In parallel, the durability of non-irradiated samples against at least 43 thermal regeneration cycles was investigated on both adsorbents. Fresh, irradiated and thermally regenerated samples were analyzed using different characterization techniques. The characterizations, and more specifically Xe adsorption at 296 K, did not show particular alterations due to the irradiation and thermal regeneration cycles. This is a major step forward for more efficient radioxenon trapping as it proves that both adsorbents can be used up to these irradiation levels and withstand 43 thermal regeneration cycles without any significant loss of Xe adsorption performance. Noteworthily, peak shifting and broadening were observed in the Si NMR signals of irradiated Ag-ETS-10 due to the paramagnetic Cs decay product.

中文翻译：

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用于收集放射性氙的 Ag-ETS-10 和 Ag-ZSM-5 的抗辐射性和热再生循环耐久性


高效的多孔吸附剂对于以下方面至关重要：减少核设施的放射性氙排放、氙的生产以及秘密核武器试验的检测。银交换沸石或类似物，特别是 Ag-ZSM-5 和 Ag-ETS-10，是这些应用的有希望的候选者。然而，关于它们的耐辐射性的知识还缺乏，并且需要进一步研究它们对热再生循环的耐久性。首次通过高达约 100MGy 的 Xe 原位辐照 Ag-ETS-10 和 Ag-ZSM-5 来研究其耐辐射性。同时，研究了两种吸附剂未辐照样品对至少 43 次热再生循环的耐久性。使用不同的表征技术对新鲜的、辐照的和热再生的样品进行分析。表征，更具体地说是 296K 下的 Xe 吸附，没有显示出由于辐照和热再生循环而发生的特殊变化。这是更有效地捕获放射性氙的重要一步，因为它证明两种吸附剂都可以在这些辐照水平下使用，并能承受 43 次热再生循环，而不会显着损失氙吸附性能。值得注意的是，由于顺磁 Cs 衰变产物，在辐照的 Ag-ETS-10 的 Si NMR 信号中观察到峰移和展宽。