Correlation between OSL and the distribution of TL traps in Al2O3:C.
Correlation between OSL and the distribution of TL traps in Al2O3:C.
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OSL 与 Al2O3:C 中 TL 陷阱分布之间的相关性。
DOI：
10.1093/oxfordjournals.rpd.a005850
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发表时间：
2002
影响因子：
1
通讯作者：
M. Akselrod
中科院分区：
文献类型：
--
作者：
A. E. Akselrod;M. Akselrod
已知Al2O3：C单晶在不同样品之间表现出其热释光（TL）辉光曲线形状的一些变化。这种变化归因于Al_2O_3：C中的TL峰是由几个陷阱的集合产生的。重要的是要了解陷阱分布的哪一部分与这种材料中的光激发光（OSL）过程相关。晶体的TL峰的半高宽（FWHM）差高达30%，并在这项研究中使用的晶体具有双峰发光曲线。发现波长大于525 nm的漂白主要耗尽TL发光曲线的低温部分，而高温峰不受影响。结果表明，当预辐照退火温度从500 ℃升高到1000 ℃时，反常双峰的高温部分消失。还研究了不同发光曲线形状样品的光转移发光过程和F和F+中心的转换。这项研究的实用方面是重要的OSL剂量学，因为这种晶体具有宽或双TL峰，可以使它难以漂白OSL剂量计非常低的剂量测量。
Al2O3:C single crystals are known to exhibit some variation of their thermoluminescence (TL) glow curve shape from sample to sample. This variation is attributed to the fact that the TL peak in Al2O3:C is produced by the set of several traps. It is important to understand what part of the trap distribution correlates with the optically stimulated luminescence (OSL) process in this material. Crystals with a difference in the full-width, half-maximum (FWHM) of the TL peak as big as 30% and crystals having double-peak glow curves were used in this study. It was found that bleaching with a wavelength longer than 525 nm depletes mostly the low temperature part of the TL glow curve, leaving the high temperature peak unaffected. It was shown that when the pre-irradiation annealing temperature was increased from 500 to 1000 degrees C, the high temperature part of the abnormal double peak disappears. The phototransferred luminescence (PTTL) processes and conversion of F and F+ centres were also studied for samples having different glow curves shape. The practical aspect of this research is important for OSL dosimetry, because such crystals with wide or double TL peak can make it difficult to bleach OSL dosemeters for very low dose measurements.