Synthesis and Thermoluminescence of Scandium-Titanium Based Oxide Mixture
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Synthesis and Thermoluminescence of Scandium-Titanium Based Oxide Mixture Iliana C. Muñoz1, Epifanio Cruz-Zaragoza2, Francisco Brown3, María A. Landavazo-Santos1, and Victor E. Alvarez-Montaño3 1 Departamento de Ciencias Químico-Biológicas, Universidad de Sonora, Rosales y Blvd. Luis Encinas J., Sonora, 83000, México. 2 Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, A.P. 70-543, México D. F. 04510, México. 3 Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Rosales y Blvd. Luis Encinas J., Sonora, 83000, México.
ABSTRACT Recently, the research team synthesized some scandium- and titanium-based oxide compounds, in order to analyze their thermoluminescent (TL) response [1-2]. The oxides mixture Sc2TiO5:Eu2Ti2O7:Sc2O3 was synthesized in equilibrium phase by solid state reaction at 1100 °C / 48 h. The structural characterization was performed by XRD and SEM. The TL properties of this oxide mixture were examined after exposing it to gamma radiation from a 60Co source. The glow curve showed two main glow peaks at 151 °C and 260 °C, yet the curve shape looks quite complex, revealing that it is composed by overlapped individual TL peaks, which was confirmed with the Tstop preheat method performed [3]. The linear dose-response between 150 to 600 Gy was obtained, followed by a slow saturation stage. The intensity of the glow curves increases as the radiation dose increases, and their maxima remain at the same temperature values, which indicates that the TL phenomenon follows first-order kinetics [4]. After ten irradiation-TL readout cycles at 500 Gy, good stability (SD 2.02 %) between TL integrated response and the exposure dose was found. It is concluded that Sc2TiO5:Eu2Ti2O7:Sc2O3 is a promising material to use as high-dose dosimeter.
INTRODUCTION Recently, this team first reported a study on the TL properties of Sc2TiO5 exposed to beta radiation. This compound, showed a wide linear behavior dose-response, good reproducibility, and a maximum peak centered at 260 °C [2]. The results of this previous work support the possible use of Sc2TiO5 as a new phosphor in high ß-dose dosimetry. On the other hand, the team has recently reported the TL features of Sc2O3 exposed to beta-particle irradiation. Characteristic glow curves exhibit two main TL maxima, located at 74 and 192 °C when a 2 °C/s heating rate is used. The TL response as a function of dose exhibited a linear behavior for doses below 70 Gy. Then, it is concluded that this oxide is a promising phosphor material to use as a TL dosimeter [1]. These results have encouraged the team to continue its research on the TL properties of both materials, but now, as a mixture activated with europium. The aim of this work is to observe the synergy between both discandium titanate and scandium oxide, europium activated, over TL properties looking for a best performance. It is known, that the oxide mixed in different proportions can control the properties of certain semiconductors [5]. Currently, there is no previous research re
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