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In this study, the highly sensitive CaSO₄:Tb glass capsule type TLDs are fabricated and their trap parameters are determined. The optimum conditions of fabricating of CaSO₄:Tb phosphor was obtained to be in impurity concentration of Tb 1.0 mol% and sintering of 600 ℃, 2 hr. The glow curve of CaSO₄:Tb consists of three glow peaks and these peaks are isolated by thermal bleaching method. Activation energy of the three glow peaks measured by the initial rise, the peak shape and the heating rate method are 0.70, 0.87, and 1.03 eV. The frequency factors are 1.76 × 10^(9) , l.74×10^(9), and 9.77×10^(8) s^(-1), and the kinetic orders are 1.12. 1.46. and 1.34. respectively. The isolated glow peaks are fitted by least square method and optimum temperature range of the main peak for radiation dosimetry is 230~295 ℃.
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