Abstract
Anion-deficient corundum and TLD-500 detectors on their basis were studied for a possible correlation between the thermoluminescence (TL) yield in the high-temperature TL peak at 830 K and the transformation of intrinsic defects and contents of impurities. Only 40– 60% of TLD-500 detectors were found to have 830 K TL peak. The efficiency of thermally stimulated direct conversion of F and F+ centers in the 800–930 K region depends on the presence of TL peak at 830 K. Obtained data point to the quenching role of the Ti impurity in the formation of the 830 K TL peak. Also, these data provide indirect evidence of association of the 830 K TL peak with Cr3+ ions.
Highlights
It was found in [1, 2, 3] that thermoluminescence (TL) response in TLD-500 detectors based on aniondeficient corundum ( -Al2O3- ) is dose-proportional in the high-temperature peak at 830 K
Comparison of the changes in the CF and CF+ shows that annealing in the range of 830–920 K causes only ~30% of transformed F centers convert into F+ centers
In order to better understand the nature of the relaxation processes in -Al2O3, and in the region of the 830 K TL peak in particular, we studied in the series of experiments changes in the PL response separately for Ali+, Ti3+ and Cr3+ centers (IAl, ICr and ITi) depending on Ta in the 300–1400 K range
Summary
It was found in [1, 2, 3] that thermoluminescence (TL) response in TLD-500 detectors based on aniondeficient corundum ( -Al2O3- ) is dose-proportional in the high-temperature peak at 830 K. It is known that the luminescence of F centers (anion vacancy with two electrons) at T>700 K including the high-temperature peak was thermally quenched. The research has precisely established only the relationship of the TL yield in the 570–600 K peak with chromium impurity [5]. It is caused mainly by the luminescence of Cr3+ ions and is called "chromium" peak. The objective of this study is detection in -Al2O3- of possible correlations of TL output in the high-temperature peak at 830 K with the transformation of intrinsic defects and contents of impurities
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