阶梯退火法进行复杂热释光发光曲线分析的数值模拟

Numerical simulation of complex thermoluminescence glow curve analysis by step annealing

在热释光发光动力学分析中经常会遇到多个发光峰共存且有一定重叠的发光曲线,阶梯退火法利用前置加热逐渐清除低温峰成分的影响,在一定程度上实现多峰的分离,在复杂热释光发光曲线分析中具有重要作用。采用MatLab编程,按一阶动力学模型模拟生成各种条件下的热释光发光曲线,同时根据阶梯退火法模拟生成经过前置加热并冷却后二次加热的发光曲线。对二次加热的发光曲线进行初始斜率分析,获得其陷阱深度,计算结果与设定的动力学参数取得了很好的一致性。

In the dynamic analysis of thermoluminescence,it is common to encounter the glow curve with multiple peaks overlapped to some extent.Step annealing method uses pre-heating to gradually remove the influence of low temperature peak components,and to achieve the separation of multiple peaks to a certain extent,which plays an important role in the analysis of complex glow curve.In this paper,MatLab program is used to simulate the glow curves under various conditions according to the first-order dynamic model,and the step-annealing method is used to simulate the glow curves during the secondary heating after the process of pre-heating and rapid cooling.The initial rising slope of the glow curve of secondary heating is analyzed,and the activation energy(trap depth)is obtained.The calculated results are in good agreement with the pre-set dynamic parameters.