Thermally stimulated luminescence glow curve structure of β‐irradiated CaB₄O₇:Dy

Abstract

Thermally stimulated luminescence glow curves of CaB4O7:Dy samples after β-irradiation showed glow peaks at ~335, 530 and 675 K, with a heating rate of 2 K/s. The main peak at 530 K was analyzed using the Tmax-Tstop method and was found to be composed of at least five overlapping glow peaks. A curve-fitting program was used to perform computerized glow curve deconvolution (CGCD) analysis of the complex peak of the dosimetric material of interest. The kinetic parameters, namely activation energy (E) and frequency factor (s), associated with the main glow peak of CaB4O7:Dy at 520 K were evaluated using peak shape (PS) and isothermal luminescence decay (ILD) methods. In addition, the kinetics was determined to be first order (b =1) by applying the additive dose method. The activation energies and frequency factors obtained using PS and ILD methods are calculated to be 0.72 and 0.72 eV and 8.76 × 10(5) and 1.44 × 10(6) /s, respectively.

Shortwave Ultraviolet Persistent Luminescence of Sr2MgSi2O7: Pr3+

“…Obviously, this is not the case for the investigated sample, where a gradual shift of T max to higher values with the increase of T stop is observed. Such behaviour strongly indicates that the activation energies of traps in Sr 2 MgSi 2 O 7 are continuously distributed [70,71].…”

“…where I(T)-intensity as a function of temperature; C-a constant that includes a frequency factor (assumed to be independent of temperature); and T-temperature. According to Equation ( 1), the initial rise part of the glow peak is represented by a straight line with a slope of −E a if ln(I) is plotted as a function of indicates that the activation energies of traps in Sr2MgSi2O7 are continuously distributed [70,71]. To determine trap depth values Ea, all glow curves were analyzed by applying IRA.…”