Abstract During experiments involving heating of dosimetric materials, trapped electrons are thermally excited and subsequently recombine with holes, producing a thermally stimulated luminescence signal. Thermal stimulation can take place either at a constant elevated temperature giving rise to a isothermal decay signal (PID), or with a constant heating rate which gives rise to a thermoluminescence (TL) signal. The recombination pathways during thermal stimulation stage (also called the readout stage), can be either of a delocalized nature involving the conduction band, or of a localized nature involving an excited state of the trapped electrons. The present work investigates the experimental conditions which can distinguish between delocalized and localized transitions during the readout stage. The dosimetric materials used in this study are LiF:Mg,Ti, BeO, a natural apatite and artificial porcelain. The results show that during the readout stage with a constant heating rate, the prevalent recombination mechanism in all these materials involves delocalized transitions. However, the results show that during an isothermal decay experiment, the recombination mechanism in LiF:Mg,Ti and BeO involves delocalized transitions, whereas in the case of apatite and artificial porcelain the recombination takes place through localized transitions.

中文翻译：

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剂量学材料线性和等温加热过程中的热释光过程研究

摘要 在涉及加热剂量学材料的实验中，被俘获的电子被热激发，随后与空穴复合，产生热激发的发光信号。热刺激可以在产生等温衰减信号 (PID) 的恒定升高温度下进行，也可以在产生热致发光 (TL) 信号的恒定加热速率下进行。热刺激阶段（也称为读出阶段）期间的复合路径可以是涉及导带的离域性质，也可以是涉及被俘获电子的激发态的局域性质。目前的工作研究了在读出阶段可以区分离域和局部跃迁的实验条件。本研究中使用的剂量学材料是 LiF：Mg、Ti、BeO，一种天然磷灰石和人造瓷。结果表明，在恒定加热速率的读出阶段，所有这些材料中普遍的复合机制涉及离域跃迁。然而，结果表明，在等温衰变实验中，LiF:Mg、Ti 和 BeO 的复合机制涉及离域转变，而在磷灰石和人造瓷器的情况下，复合机制是通过局部转变发生的。