研究目的
The aim of this work is to study PTTL from synthetic quartz annealed at 900oC.
研究成果
Phototransferred thermoluminescence of annealed synthetic quartz induced using 470 nm blue light has been studied. Samples were annealed at 900oC for 10, 30 and 60 minutes. The glow curve measured at 1oC s-1 after irradiation to 200 Gy shows six peaks for all samples. However, only three PTTL peaks were reproduced for the sample annealed for 60 minutes. When the duration of annealing was reduced to 10 minutes, only two PTTL peaks were induced. For an intermediate duration of 30 minutes only one PTTL peak was reproduced. Deep traps beyond 600oC make a negligible contribution to the PTTL. All the PTTL peaks studied are affected by thermal quenching. The activation energy of thermal quenching for peaks A1 and A3 were evaluated as 0.62 ± 0.02 eV and 0.65 ± 0.02 eV respectively. The PTTL intensity goes through a peak as a function of illumination time. The change is modelled using sets of coupled linear differential equations based on systems of donors and acceptors whose number is determined by preheating temperature. Competition effects involved in the PTTL have been reported and modelled using an empirical model.
研究不足
The signal in the samples annealed for 30 and 60 minutes was too low for reliable analysis. Deep traps beyond 600oC make a negligible contribution to the PTTL.