Correcher V, Gómez-Ros J M, Garcia-Guinea J, Martin P L, Delgado A
CIEMAT. Av. Complutense 22, Madrid 28040, Spain.
Radiat Prot Dosimetry. 2006;119(1-4):176-9. doi: 10.1093/rpd/nci613. Epub 2006 May 30.
This work reports about the thermal stability of the blue thermoluminescence (TL) of a well-characterised natural bentonite from Almeria (Spain). The main interest of this clay, mainly composed of montmorillonite, is because of its application in the field of high-level radioactive waste (HLW) repository in deep-lying rocks. As observed in other aluminosilicates, bentonite exhibits a very complex structure of the emission spectra based on a wide broad maximum peaked at approximately 265 degrees C that can be associated to physico-chemical processes such as dehydroxylation processes, consecutive breaking linking of bonds, formation of hydrolysed ions and redox reactions. The thermal stability tests performed at different temperatures confirm a continuum in the distribution of traps. Hence, the glow curve analysis methods commonly used for synthetic materials based on single discrete traps cannot be applied for this material and the kinetic parameters were fitted assuming an exponential distribution of trapped electrons.
这项工作报道了来自西班牙阿尔梅里亚的一种特性明确的天然膨润土的蓝色热释光（TL）的热稳定性。这种主要由蒙脱石组成的黏土的主要关注点在于其在深埋岩石中的高放废物（HLW）处置库领域的应用。正如在其他铝硅酸盐中所观察到的，膨润土基于一个在约265℃达到峰值的宽峰表现出非常复杂的发射光谱结构，这可能与诸如脱羟基过程、键的连续断裂、水解离子的形成以及氧化还原反应等物理化学过程有关。在不同温度下进行的热稳定性测试证实了陷阱分布的连续性。因此，基于单个离散陷阱的常用于合成材料的发光曲线分析方法不能应用于这种材料，并且在假设俘获电子呈指数分布的情况下拟合了动力学参数。
