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Novel insights in the study of water penetration into polycrystalline UO_2 by secondary ion mass spectrometry

机译:二次离子质谱法研究水渗透到多晶UO_2中的新颖见解

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Oxygen and water species (e.g., OH-, H_2O) diffusion in polycrystalline UO_2 are key parameters to investigate in order to predict spent fuel behaviour in a final repository in the event of exposure to groundwater. In this work, ~(18)O tracer diffusion is evaluated by means of secondary ion mass spectrometry on a UO_2 pellet exposed to ~(18)O-labelled water at room temperature for 3 months. Depth profiling up to 22 μm beneath the pellet surface clearly indicates a combination of oxygen diffusion into the UO_2 lattice and water species diffusion along grain boundaries, behaving as high-diffusivity-paths. The relevant coefficients have been estimated around 1.4 × 10~(-24) m ~2 s~(-1) for lattice diffusion and around 2.3 × 10 ~(-16) m~2 s~(-1) for grain boundary diffusion.
机译:氧和水物种(例如OH-,H_2O)在多晶UO_2中的扩散是要研究的关键参数,以便预测暴露在地下水中的最终储存库中的乏燃料行为。在这项工作中,通过二次离子质谱对在室温下暴露于〜(18)O标记的水的UO_2沉淀物进行了3个月的评估,以评估〜(18)O示踪剂的扩散。颗粒表面以下高达22μm的深度轮廓清楚地表明,氧扩散到UO_2晶格中和水物种沿着晶界扩散,表现为高扩散路径。晶格扩散的相关系数约为1.4×10〜(-24)m〜2 s〜(-1),晶界扩散的相关系数约为2.3×10〜(-16)m〜2 s〜(-1) 。

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