Thermal Effect on TL Response of Single Doped LiF+NaF:RE Polycrystalline Phosphors
In this work, the sintering and annealing effects on the thermoluminescent (TL) behavior of undoped and rare earth (RE)-doped LiF+NaF powder samples (RE = Ce3+, Eu3+, Lu3+ or Tl+, at 0.5 mol%) was analyzed by evaluating the sensitivity to gamma radiation and TL response of the material. The polycrystalline samples were obtained by solid state reaction at 1000°C. The samples were irradiated in a Gammacell-3000 Elan irradiator loaded with 137Cs sources. The glow curves of the LiF+NaF doped with lutetium or thallium show an intense glow peak at about 175°C and 135°C, respectively. When the phosphor was doped with cerium or europium the glow curves were complex in their structure, with TL peaks observed at 155°C and 165°C, respectively. The linear dose-response was between 10 and 50 Gy for cerium, europium or lutetium doped LiF+NaF samples, while for the thallium doped and undoped samples such intervals were 10-100 Gy and 10-500 Gy, respectively. Because the shape of the glow curves were complex, the analysis was carried out in (i) samples without a sintering treatment where the TL response was found insensitive to pre-irradiation annealing treatment, and (ii) sintered samples (300, 350, 400 or 500 °C), in this last case the TL response was dependent on the annealing temperature (100-400 °C), finally (iii) the kinetics parameters of the glow curves were analyzed by assuming a general order kinetics model. The observed glow curves and TL characteristics of the LiF+NaF:RE phosphor make attractive this material to be useful in gamma dose dosimetry.
Bonfligi F., Almaviva, S., Cedola, A., Franzini, I., Lagomarsino, S., Pelliccia, D., Montereali, R. Visible emitting color centers in lithium fluoride for X-ray imaging applications. Radiation Measurements, 45, 599-601 (2010). http://dx.doi.org/10.1016/j.radmeas.2009.09.011
Bos, A., Vijverberg, R, Piters, T., McKeever, S. Effects of cooling and heating rate on trapping parameters in LiF:Mg, Ti crystals. Journal of Physics D: Applied Physics, 25, 1249-1257 (1992). http://dx.doi.org/10.1088/0022-3727/25/8/016
García-Haro, A., Bernal, R., Cruz-Vázquez, C., Kitis, G., Orante-Barrón, V., Casta-o, V. Thermoluminescence of NaF:Eu3+ phosphor exposed to beta particle irradiation. Physica Status Solidi C, 10(2), 176-179 (2013). http://dx.doi.org/10.1002/pssc.201200509
González, P., Furetta, C., Marcazzó, J., Cruz-Zaragoza, E., Pérez Cruz, L. Determination of kinetics parameters of the main glow peaks for KMgF3:Lu and LiF:Mg phosphors after long-term high temperature storage. Applied Radiation and Isotopes, 79, 67-72 (2013). http://dx.doi.org/10.1016/j.apradiso.2013.04.033
Kitis, G. & Tuyn, J. Sensitivity of LiF:Mg, Ti thermoluminescence detectors after various annealing procedures. Nuclear Instruments and Methods in Physics Research B, 132, 639-646 (1997). http://dx.doi.org/10.1016/S0168-583X(97)00487-4
Kitis, G., Gomez-Ros, J. & Tuyn, J. Thermoluminescence glow-curve deconvolution functions for first, second and general orders of kinetics. Journal of Physics D: Applied Physics, 31, 2636-2641 (1998). http://dx.doi.org/10.1088/0022-3727/31/19/037
Kitis, G., Tzima, A., Cai, G., Furetta, C. Low-temperature (80-240°C) annealing characteristics of LiF:Mg, Cu, P. Journal of Physics D: Applied Physics, 29, 1601-1612 (1996). http://dx.doi.org/10.1088/0022-3727/29/6/028
Mariani, D. and Alvarez, J. Thermoluminescence in KI, KBr, NaCl and NaF crystals irradiated at room temperature. Journal of Physics C: Solid State Physics, 11, 3499-3509 (1978). http://dx.doi.org/10.1088/0022-3719/11/16/019
McKeever, S. Optical absorption and luminescence in lithium fluoride TLD-100. Journal of Applied Physics, 56, 2883-2889 (1984). http://dx.doi.org/10.1063/1.333826
Montereali, R. Point defects in thin insulating films of lithium fluoride for optical microsystems. In: H.S. Nalwa (Ed.), Handbook of Thin Film Materials. Ferroelectric and Dielectric Thin Films (pp. 399-431). San Diego:AcademicPress, (2002). http://dx.doi.org/10.1016/b978-012512908-4/50043-6
Nahum, J., Wiegand, D. Optical properties of some F-aggregate centers in LiF. Physical Review, 154, 817–830 (1967). http://dx.doi.org/10.1103/PhysRev.154.817
Sharma, J. Thermoluminescence properties of some alkali halides. Physical Review, 101(4), 1295-1297 (1956). http://dx.doi.org/10.1103/PhysRev.101.1295
Tomita, A., Takeyasu, T, Fukuda, Y. Thermally stimulated exoelectron emission and thermoluminescence in NaF single crystals. Radiation Protection Dosimetry, 65, 405-408 (1996). http://dx.doi.org/10.1093/oxfordjournals.rpd.a031672
Yuan, X. & McKeever, S. Impurity clustering effects in magnesium-doped lithium fluoride. Physica Status Solidi A, 108¸ 545-551 (1988).
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