Abstract
A procedure has been developed for estimating the uniformity of anion vacancy distribution in TLD-500 detectors on the basis of anion-deficient corundum single crystals. Vacancy distribution topograms were constructed for TLD-500 detectors with different sensitivities to irradiation. Analysis of the topograms provided correlations between average anion vacancy concentrations and thermoluminescent (TL) yields in the main peak with a maximum at 450 K. To confirm the pattern of regularities, the effects of high-temperature annealing of TLD-500 samples in air at T = 1700 K were studied depending on its duration. Increasing the annealing time from 40 to 105 minutes was found to correlatedly reduce the anion vacancy concentrations and TL-yields in the basic and high-temperature peaks at 450 and 830 K, respectively.
Highlights
The available data [1] indicate that the luminescent activity of anion-deficient corundum (α-Al2O3-δ) crystals and TLD-500 detectors on their basis is associated with the presence of anion vacancies
For estimating the non-uniformity of anion vacancy distribution in the ∅5×1 mm3 samples studied, which are used as TLD-500 detectors as well, optical absorption (OA) spectra were measured locally at 9 points
That study investigated the distribution of defects along the rod to ensure that parts of the rod containing either minimum anion vacancies or maximum growth macrodefects are removed before detectors are made from it
Summary
The available data [1] indicate that the luminescent activity of anion-deficient corundum (α-Al2O3-δ) crystals and TLD-500 detectors on their basis is associated with the presence of anion vacancies. Increasing the annealing time from 40 to 105 minutes was found to correlatedly reduce the anion vacancy concentrations and TL-yields in the basic and high-temperature peaks at 450 and 830 K, respectively.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
