Thermoluminescence properties of rare earth doped lithium magnesium borate phosphors

Photoluminescence and thermostimulated luminescence processes in rare-earth-doped CaSO4 phosphors

Boron that appears in borate form in nature is an essential additive to a variety of industrial products. Recently, certain boron compounds have attracted attention in high technology utilization areas owing to their special crystal and optical characteristics. Thermoluminescent (TL) dosimetry that is used to record amount of radiation exposure is one of such areas. Two borates searched for candidacy in TL dosimetry are lithium tetraborate and lithium triborate. These materials are synthesized and metal doped by numerous researchers to be tested for thermoluminescence response. Lithium tetraborate has aroused interest of scientists since 1960s by the courtesy of the thermoluminescence (TL) property. However, lithium triborate is rather new in this area. This study compromises a broad overview including synthesis methods employed for the production of these two materials. Furthermore, the TL properties that have significant effect on the TL dosimetry potential of a compound are noted along with the detailed information on TL measurement procedure specifications.

/pdf/an-overview-on-preparation-and-tl-characterization-of-53vw9guk31.pdf

An Overview on Preparation and TL Characterization of Lithium Borates for Dosimetric Use

UV and gamma ray induced thermoluminescence properties of cubic Gd2O3:Er3+ phosphor

Photoluminescence, thermoluminescence and evaluation of some parameters of Dy3+ activated Sr5(PO4)3F phosphor synthesized by sol-gel method

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.

https://iopscience.iop.org/article/10.1088/0022-3727/42/10/105412/pdf

Influence of heating rate on thermoluminescence of Mg2SiO4 : Tb dosimeter

Thermoluminescence studies of thermally treated CaB4O7:Dy

The effect of heating rate on the thermally stimulated luminescence (TSL) emission due to the temperature lag (TLA) between the TSL material and the heating element has been investigated using Li2B4O7:Cu,Ag,P dosimetric materials. The TLA becomes significant when the material is heated at high heating rates. TSL glow curves of Li2B4O7:Cu,Ag,P material showed two main peaks after β-irradiation. The kinetic parameters, namely activation energy (E) and frequency factor (s) associated with the high temperature main peak of Li2B4O7:Cu,Ag,P were determined using the method of various heating rates (VHR), in which heating rates from 1 to 40 K s−1 were used. It is assumed that non-ideal heat transfer between the heater and the material may cause significant inconsistency of kinetic parameter values obtained with different methods. The effect of TLA on kinetic parameters of the dosimeter was examined.

Effect of heating rate on kinetic parameters of β-irradiated Li2B4O7:Cu,Ag,P in TSL measurements

Karali, T., Rowlands, A. P., Prokic, M., Townsend, P. D., Halmagean, E. (2002). Thermoluminescent spectra of rare earth doped MgB4O7 dosemeters. Radiation Protection Dosimetry, 100 (1-4), 333-336.

Thermoluminescent spectra of rare earth doped MgB4O7 dosemeters.

Wavelength resolved spectra of the dosimetric materials CaSO 4 and MgB 4 O 7 with the rare earth (RE) ions Dy and Tm are presented. The study of co-doped samples provides, within a single sample, unequivocal evidence of a glow peak displacement of the two dopants. In the case of the main dosimetric peak for CaSO 4 at ∼220°C, a reproducible systematic temperature difference of 7 to 8°C is observed between the glow peaks near 230 to 240°C for Tm and Dy. No comparable displacement is detected between Tm And Dy for the main dosimetric peak for MgB 4 O 7 at about 180°C. However, higher temperature glow peaks above 300°C display a noticeable displacement of Dy and Tm on the scale of 30°C. This research provides further evidence supporting the view that the RE ions could form part of a complex defect acting as both charge trap and recombination centre.

Comparision of TL Spectra of Co-Doped Dosimetric Materials

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