In this work, Zn 2 Eu x Ti 1−x O 4 and Zn 2−x Eu x TiO 4 (x = 0, 1, 2 and 3 mol%) powders were synthesized by complex polymerization method (CPM) and calcined at 1000 °C for 4 h. The powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy in the visible region and photoluminescence properties (PL). The photocatalytic properties were estimated by degradation of methylene blue (MB) dye when irradiated by UV lamps. X-ray diffraction results demonstrated the existence of Zn 2 TiO 4 as primary phase and ZnO with secondary phase. According to diffractograms, the crystallite size varied between 49 and 67 nm. The Eu 3+ ions introduction provides increased absorption in visible region, but the band-gap remains practically constant. In samples were observed an increased in photocatalysis with the increase in europium concentration, while in the Zn 2 Eu x Ti 1−x O 4 samples, photocatalysis was reduced to europium concentrations greater than 1%. Eu 3+ doped Zn 2 TiO 4 provided a photoluminescent intensity increasing. CIE chromaticity coordinates confirm emission in the red region of the phosphor.
Radiation dosimetry has the purpose of quantifying the dose received by the occupationally exposed individual. The device used in this process is called a dosimeter, the dosimeter can be used in different situations, for example, the dosimeter used to quantify the dose received in the fingers is the ring model dosimeter, for the extremity, which is the focus of this work. In Brazil, we still do not have standards for the calibration of extremity dosimeters, therefore, in this work, the CASEC recommendations were used, adapted for extremity dosimetry. For a dosimeter to be used in its respective routine, it must present results within some pre-established limits in reference standards. For this purpose, energy dependence and angular dependence tests were carried out. To calibrate the LiF:Mg,Ti thermoluminescent dosimeters, a phantom rod was used. The phantom rod has the function of simulating the region of interest, in the case of this work, the fingers. The dosimeters were irradiated in the magnitude Hp(0.07), with the doses and energies recommended by the CASEC standard. The aim of this work is to characterize end dosimeters in the ring model with LiF:Mg,Ti detectors.
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