Radiofluorescence as a detection tool for quartz luminescence quenching processes
Radiofluorescence as a detection tool for quartz luminescence quenching processes
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DOI：
10.1016/j.radmeas.2018.03.008
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发表时间：
2018-12-15
影响因子：
2
通讯作者：
Schmidt, Christoph
中科院分区：
文献类型：
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作者：
Friedrich, Johannes;Kreutzer, Sebastian;Schmidt, Christoph
热猝灭是石英中的一种众所周知的现象，它描述了发光效率(光输出)随样品温度的下降。本文对三种不同石英样品从500℃到室温的冷却过程中的紫外辐射荧光(RF)信号进行了监测和分析。得到的热猝灭参数W(活化能)和K(常数)与已公布的值一致，只有一个样品除外。石英中的另一种猝灭过程是辐照后发光灵敏度的降低(剂量猝灭)，这主要是已知的具有大古剂量的旧样品的热释光和光致发光。在这里，使用110℃热释光峰的强度和OSL信号来监测剂量猝灭效应。分析了UV-OSL和UV-TL信号，发现它们非常相似。在高剂量下，在TL和OSL重复测量周期之间记录的UV-RF与连续记录的参考信号不同。此外，数值模拟被用来破译石英中的电荷传输过程。总之，热猝灭模拟能够模拟实验结果，并证实UV-RF是确定热猝灭参数的有价值的工具。剂量猝灭模拟在高剂量范围内与实验结果不同，但有助于理解剂量猝灭的基本原理：不同中心之间的电荷竞争。
Thermal quenching is a well-known phenomenon in quartz, which describes the decrease in luminescence efficiency (light output) with sample temperature. In the present work, the UV radiofluorescence (RF) signals of three different quartz samples during cooling from 500 degrees C to room temperature were monitored and analysed. Resulting thermal quenching parameters W (activation energy) and K (constant) agree with published values, except for one sample. Another quenching process in quartz is the reduction of luminescence sensitivity following irradiation (dose quenching), mainly known for TL and OSL of old samples with large palaeodoses. Here, the intensity of the 110 degrees C TL peak and the OSL signal were used to monitor the dose quenching effect. UV-OSL and UV-TL signals are analysed and found to be very similar. The UV-RF recorded during irradiation in between repeated cycles of TL and OSL measurements differs at high doses from a continuously recorded reference signal.Furthermore, numerical simulations are presented to decipher the charge transport processes in quartz. In summary, thermal quenching simulations are capable of mimicking experimental findings and confirm that UV-RF is a valuable tool to determine thermal quenching parameters. Dose quenching simulations differ from experimental results in the high dose range but help to understand the basic principle of dose quenching: charge competition of different centres.