The shift of the thermoluminescence peak maximum temperature versus heating rate, trap filling and trap emptying: Predictions, experimental verification and comparison

摘要

The peak maximum temperature (T-max) at the maximum intensity (I-max) are basic characteristics of a thermoluminescence (TL) peak. It is theoretically predicted and experimentally verified that T-max shifts to higher temperatures as the readout heating rate increases. It is also predicted theoretically that T-max shifts to lower temperatures as the radiation dose increases. However, although, experiments of the TL as a function of dose are the most common in TL literature the predicted shift is never unambiguously verified. This discrepancy between theory and experiment is extensively investigated in the present work. The behavior of the T-max as a function of (a) heating rate, (b) dose (trap filling) and (c) trap decay (trap emptying) was studied in CaSO4:Dy, CaSO4:Tm, LiB4O7:Cu,In, MgB4O7:Dy,Na, Al2O3:C, BeO, and a sample of natural salt un-annealed and annealed at 600. The results showed that the shift of T-max as a function of heating rate and trap emptying are experimentally verified. On the other hand the shift of T-max as a function of radiation dose (trap filling) is not verified experimentally. The results are extensively discussed and the explanations of the three different sources of T-max shift are attempted.