Influence of heating rate on thermoluminescence of Mg2SiO4 : Tb dosimeter
Makaleler > Tam Makale · 2009
Yazarlar: M Gökçe, K F Oğuz, T Karalı, M Prokic
Journal of Physics D: Applied Physics, Uluslararası, Wos, 2009, cilt 42, ss 105412-105412
DOI: 10.1088/0022-3727/42/10/105412
Özet
In this paper the influence of different heating rates on thermoluminescence (TL) kinetics, glow-peak temperatures, heights and integrated TL intensities of the main glow peak of recently produced Mg 2 SiO 4 : Tb dosimeters are reported. The TL properties of the phosphor were investigated after β-irradiation at room temperature. Glow curve shape, peak shape, repeated initial rise and variable heating rate methods were used to analyse the TL kinetics of the main glow peak at 473 K. Results show that the TL glow peak of Mg 2 SiO 4 : Tb phosphor obeys second-order kinetics. Analysis of the main dosimetric peak by using the methods mentioned above revealed that activation energy ( E ) is about 1 eV and the pre-exponential factor ( s ) is in the range 10 10 –10 11 s −1 . In addition it is ascertained that the glow-peak temperature increases with heating rate. The glow-peak height showed two maxima in the heating rate range investigated. The behaviour of the integrated TL intensities and the maximum glow-peak temperatures related to the heating rate have been discussed in terms of thermal quenching and clustering formation.