Sentetik kuvars ve CaSO4:Dy (TLD-900) kristallerinin dozimetrik ve termoluminesans özelliklerinin incelenmesi

ABSTRACT INVESTIGATION OF DOSIMETRIC AND THERMOLUMINESCENCE PROPERTIES OF CaS04:Dy (TLD-900) AND SYNTHETIC QUARTZ CRYSTALS KAFADAR Emir Vural M. SC, in P.E. University of Gaziantep Supervisor: Assoc.Prof. Dr. Zihni ÖZTÜRK July 2004, 53 pages The additive dose (AD), Tm(E^-Tstop, repeated initial rise (RIR), variable heating rate (VHR) and computerized glow curve deconvolution (CGCD) methods were used to determine the number of peaks and kinetic parameters (kinetic orders b, activation energy E& and attempt-to-escape frequency s) associated with the TL glow peaks in unannealed acid purified synthetic quartz (APSQ) produced by the Fluka company after beta-irradiation between the dose level 0.02 Gy and 2.5 kGy. The Ea- Tstop and CGCD methods were indicated that the glow curve of this material is the superposition of at least seven first-order components, which were referred to as Pl- P7, in the temperature range between room temperature and 500 °C. The results have indicated that kinetic parameters vary fairly from method to method. The dose responses and fading process, which are very useful in radiation dosimetry and archeological dating, of individual TL peaks of this material were also examined. The dose responses of all peaks have similar pattern, first they follow strong linearity and then saturate at different dose levels. The peaks 1 and 2 were completely mdisappeared after one month storage in the dark room at room temperature. On the other hand, the intensity of peak 3 was reduced to 27% of its original value whereas the other peaks (P4-P7) were not sufficiently affected during this period. Additionaly, the glow curve structure of CaSC>4 was studied by AD method and it was observed that its glow curve is the superposition of six firs order glow peaks. Keywords: thermoluminescence, thermoluminescent dosimetry, TLD, kinetic parameters, trapping parameters, CaSO^Dy, APSQ, TLD- 900. IV