Influence of heating rate on thermoluminescence of Mg₂SiO₄ : Tb dosimeter

Abstract

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 Mg2SiO4 : 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 Mg2SiO4 : 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 1010–1011 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.

Thermoluminscence characteristics and dosimetric parameters of Nd+3 doped alkali borosilicate glass

“…Upon excitation, the sample here is subject to rapid heating up to a specific temperature T stop , and then we measure the luminescence decay . A series of l ( T ) graphs were obtained through many heating and cooling cycles (21 cycles), covering the range from 373 K to 573 K for T stop and 1°C/s linear heating rate …”

Evaluation of the thermoluminescence kinetic parameters of zinc‐borosilicate glass after gamma‐irradiation

“…This fairly applies to intensities smaller than 10%‐15% of the maximum intensity corresponding to a certain cut‐off temperature . A series of I ( T ) graphs were obtained through many heating and cooling cycles, covering the range from 373 K to 573 K for T stop and 1 Ks −1 linear heating rate …”

Photoluminescence, trap states and thermoluminescence decay process study of Ca2MgSi2O7: Eu2+, Dy3+ phosphor

“…Thermoluminescence is one of the possible ways to estimate the trap states of the material. TL parameter of the thermal activation energy, E which is related to the trap depth is obtained using peak shape method (Chen 1969;Chen 1983;Yuan 2004;Wang and Wang 2007;Gökçe et al 2009). The TL glow curves (figures 3 and 4) exhibit a broad peak because of the transition between ground and excited energy levels of the dopant Eu 2+ .…”