Synthesis and Thermoluminescence of a Spinel-Type Oxide Exposed to Beta-Particle Irradiation
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Synthesis and Thermoluminescence of a Spinel-Type Oxide Exposed to Beta-Particle Irradiation Francisco Brown1, Tomasa C. Hernandez-Perez1, Iliana C. Muñoz2, Victor E. Alvarez-Montaño1, Catalina Cruz-Vazquez1, Rodolfo Bernal3, Alma R. García-Haro2. 1 Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Rosales y Blvd. Luis Encinas J., Sonora, 83000, México. 2 Departamento de Ciencias Químico-Biológicas, Universidad de Sonora, Rosales y Blvd. Luis Encinas J., Sonora, 83000, México. 3 Departamento de Investigación en Física, Universidad de Sonora, Rosales y Blvd. Luis Encinas J., Sonora, 83000, México.
ABSTRACT Currently, the research team is systematically studying the oxide compounds present in the ternary system In2O3-TiO2-MgO in order to analyze its thermoluminescent (TL) response. The oxide Mg1.5InTi0.5O4 present in this system was synthesized by a solid state reaction at 1350 °C in air. The X-ray powder diffraction pattern showed a spinel-type structure for this compound. In this work, this spinel, as well as its TL properties when exposed to beta particles, are being reported for the first time. The glow curve is simple and wide with a TL maximum located at 203 °C at 21.33 Gy. The peak shows a shift to lower temperatures and it increases its intensity, as the irradiation dose increases. The lineal behavior was observed between 10.66 to 341 Gy, and no saturation signs were observed. The relative sensitivity variation was 2.7% and standard deviation after ten consecutive irradiation - TL readout cycles was 1 %. The minimum detectable dose was 5.65 Gy for this spinel-type oxide [3]. These results suggest the possible application of Mg1.5InTi0.5O4 in dosimetry.
INTRODUCTION Spinels are a group of oxides of general formula AB2O4, they crystallize in the same crystal structure of spinel mineral MgAl2O4. A and B can be divalent or trivalent cations respectively. The essential elements on a spinel are Al, Mg and O with Ti, Fe, Zn, Mn and Ca as a common impurity [1, 2]. The storage of charges after exposition to ionizing radiation is possible because of the mixture of both constituent ions, since the tetrahedral or octahedral sites work as either electron traps or hole traps. This has an important role in most of the optical and luminescent properties, especially in thermoluminescence and optically stimulated luminescence, OSL [3, 4]. Due to the TL response of each component in the ternary system In2O3-TiO2-MgO, it is probable that the obtained compounds will have better TL properties compared to the individual oxides. Eventually, these compounds could be considered as a TL dosimeters for research applications and in dosimetry of ionizing radiation. This ternary system In2O3-TiO2-MgO has been reported previously, as well as the Mg2-xIn2xTi1-xO4 (0≤x≤1) solid solution that exists between the pseudobinary system of spinel-
type compounds MgIn2O4-Mg2TiO4, [5]. This system has been selected in particular because of the TL properties of the individual components in the ternary system. Besides, t
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