Abstract Macusanite is a natural volcanic glass, which is produced by the rapid cooling of magma during a volcanic eruption. Since it typically contains concentrations of uranium, it can be used for fission-track dating. Understanding the fission-track formation process and its morphology in natural volcanic glass is of major importance in this dating method. Therefore, in this work the latent fission-track structure was investigated using the geometry evolution of etched tracks. This evolution was characterized as a function of the chemical etching time via optical microscopy and atomic force microscopy. In this way, measurements of track diameters and theoretical estimation of track depths of normal incident fission fragments were made in order to determine the bulk and track etch rates. As a result, both rates yield constant values, and therefore the defect density along the fission fragment trajectory can be considered constant.

中文翻译：

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Macusanite火山玻璃的裂变径迹演化

摘要 Macusanite 是一种天然火山玻璃，是火山喷发时岩浆迅速冷却而产生的。由于它通常含有一定浓度的铀，因此可用于裂变径迹测年。了解裂变径迹形成过程及其在天然火山玻璃中的形态对于这种测年方法非常重要。因此，在这项工作中，使用蚀刻轨迹的几何演变研究了潜在的裂变轨迹结构。通过光学显微镜和原子力显微镜将这种演变表征为化学蚀刻时间的函数。通过这种方式，对正常入射裂变碎片的轨道直径进行测量和轨道深度的理论估计，以确定体积和轨道蚀刻速率。因此，两种速率都会产生恒定值，