Thermoluminescence characterization of Ag-doped Li2B4O7 single crystal materials
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Date
2017
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Abstract
In this study, the thermoluminescence (TL) characteristics of Ag-doped and undoped lithium tetraborate (Li2B4O7, LTB) materials, grown using the Czochralski method, were reported. The TL properties of LTB:Ag, such as glow curve structure, dose response, fading and reproducibility, were investigated. The glow curve of the Li2B4O7:Ag single crystal consists of four peaks located at approximately 75, 130, 190 and 275°C; in undoped LTB, the single crystal shows a broad glow curve with peaks at 65, 90, 125, 160 and 190°C using a heating rate of 5°C/s in the 50–350°C temperature region. The high temperature peak of Ag-doped sample at 275°C has a nonlinear dose response within the range from 33 mGy to 9 Gy. There is a linear response in the range of 33–800 mGy; after which, a sublinear region appears up to 9 Gy for Ag-doped LTB single crystal. For undoped single crystal, the dose response is supralinear for low doses and linear for the region between 1 and 9 Gy. The thermal fading ratio of the undoped material is almost 60% for the high temperature peak after 7 days. Ag-doped LTB single crystal exhibits different behaviour over a period of 7 days. Copyright © 2016 John Wiley & Sons, Ltd.
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Keywords
Borates , Crystallization , Luminescent Measurements , Reproducibility of Results , Silver , Temperature , Thermoluminescent Dosimetry , Lithium compounds , Silver compounds , Thermoluminescence , boric acid , silver , tetraborate , Ag doped , Dose response , Glow curve , High temperature peaks , LTB:ag , Reproducibilities , Single-crystal materials , Thermoluminescence dosimeter , Thermoluminescence properties , Undoped LTB , chemistry , crystallization , luminescence , procedures , reproducibility , temperature , thermoluminescence dosimetry , Single crystals