Thermoluminescence characterization of Ag-doped Li2B4O7 single crystal materials

Abstract

In this study the thermoluminescence (TL) characteristics of Ag-doped and undoped lithium tetraborate (Li<inf>2</inf>B<inf>4</inf>O<inf>7</inf> 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 Li<inf>2</inf>B<inf>4</inf>O<inf>7</inf>: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. © 2023 Elsevier B.V. All rights reserved.