Thermoluminescence of Dysprosium Doped Strontium Borate Glass for (NA, LI, CA) Modifiers Irradiated to High Dose 60CO

Abstract

This article reports the characteristics of thermoluminescence (TL) dosimeter of dysprosium doped strontium borate glass for NaO, Li₂O, and CaO modifiers imposed by 10–90 Gy dose of ⁶⁰Co gamma ray irradiation. The different elements are (70.0 – x) B₂O₃–²⁰SrO–¹⁰NaO–xDy₂O₃, ¹⁰Li₂O–²⁰SrO–(70 – x)B₂O₃–(x)Dy₂O₃ and ¹⁰CaO–²⁰SrO–(70.0 – x)B₂O₃–(x)Dy₂O₃ (x = 0, 0.10, 0.30, 0.50, 0.70 mol %). The glass was formed by melt quenching method and the ranges of Dy₂O₃ were 0.0 to 0.7 mol %. Calcium strontium borate doped with 0.3 mol % Dy₂O₃ shows very good linearity on dose response and gives an excellent sensitivity at 50 Gy dose of ⁶⁰Co gamma ray irradiation. The samples N1, L1, C3 were completely amorphous. The optimums anneal temperature, time, concentration of Dy₂O₃ and heating rate were investigated for glass samples N1, L1, C3. The systematic characteristics of glow curve, TL intensity, reproducibility, sensitivity, kinetic parameters and effective atomic number were studied for three selected samples. All samples show the maximum peak from 154–200°C temperatures.