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 B O , 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 B O :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.

Structural and optical properties of Magnesium borate phosphors for dosimetric purpose

“…Several researchers have focussed on the TL characteristics of borate-based phosphors and tried to improve their TL properties by changing the preparation technique or using different modifiers or activators. Mostly the important dosimetric features of borate-based phosphors, LTB: Ag [2], LTB: Mn [3], MgB 4 O 7 :Tm, Ag [4], MgB 4 O 7 :Gd, Li [5], MgB 4 O 7 :Dy, Li and MgB 4 O 7 :Ce, Li [6][7], ZnB 2 O 4 :Sm [8], have been reported earlier. Amongst the borates, the most useful and suitable thermoluminescent (TL) materials for dosimetric uses are barium borate (BaB 2 O 4 ), lithium tetraborate (Li 2 B 4 O 7 ), magnesium tetraborate (MgB 4 O 7 ) [9].…”

New structural–optical effect in LiF–Li2B4O7 thin‐film structures in the crystallization

“…Each of these combinations is responsible for its scheme of accumulation of energy absorbed due to ionizing radiation and its relaxation through the optical channel by thermostimulated luminescence (TSL). This ability is widely used in dosimetry [9][10][11][16][17][18][19].…”

“…Each of these combinations is responsible for its scheme of accumulation of energy absorbed due to ionizing radiation and its relaxation through the optical channel by thermostimulated luminescence (TSL). This ability is widely used in dosimetry [9–11, 16–19]. The starting charge for synthesizing thin films was obtained by fusing the high‐purity components Li 2 CO 3 , B 2 O 3 , LiF, and CuO in appropriate proportions in platinum crucibles in an air atmosphere at 1000°C for 3 h. The composition of the obtained products was controlled using X‐ray phase analysis on a DRON‐4 X‐ray diffractometer.…”