Prabhu, Nimitha S and Sharmila, K and Kumaraswamy, Swaroop and Somashekarappa, H M and Sayyed, M I and Ghamdi, Hanan AI and Almuqrin, Aljawhara H and Kamath, Sudha D (2021) An examination of the radiation-induced defects and thermoluminescence characteristics of Sm2O3 doped BaO–ZnO–LiF–B2O3 glass system for γ-dosimetry application. Optical Materials, 118. ISSN 0925-3467

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Abstract

10BaO–20ZnO–20LiF-(50-x)B2O3-xSm2O3 (x = 0, 0.1, 0.3, 0.5, 0.7, and 1.0 mol %) glasses were synthesized with an objective to examine the γ-radiation-induced defects and Thermoluminescence (TL) characteristics towards potential TL dosimetry application. The addition of 0.1 mol % Sm2O3 to the host glass led to a drastic enhancement (almost two thousand times) in the TL intensity and concentration quenching was seen thereafter. The Sm2O3 concentration and γ-dose for the examination of defects and TL features were optimized to be 0.1 mol % and 3 kGy, respectively. The lack of distinct peaks in the X-Ray Diffraction pattern confirmed the glass amorphous nature. The structural modification after irradiation was conveyed in the optical absorption spec�troscopy by the presence of color centers and in Fourier Transform Infrared spectroscopy by the increase in the Non-Bridging Oxygens. The color centers were identified as Non-Bridging Oxygen Hole Center and Boron E’-center from the Electron Spin Resonance characterization. The glass manifested a good linear TL response between 0.25 and 3 kGy, high sensitivity, a minimum detection dose of 2±0.2 Gy, reusability and reproducibility after annealing at 523 K for 15 min, Zeff of 9.6, and trap activation energies between 0.47 and 1.28 eV. The application of the titled glass system as a potential TL dosimeter is proposed for food irradiation, and γ-envi�ronment (up to 3 kGy).

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