Synthesis and thermoluminescence properties of MgAl2O4:Ca laser-sintered ceramics

Author(s)

Trindade, N. M. ^{[1, 2]} ; Silva, E. P. ^[3] ; Nunes, M. C. S. ^[2] ; Munoz, J. M. ^[2] ; Santos, J. C. A. ^[4] ; Yoshimura, E. M. ^[1] ; Silva, R. S. ^[3]

Affiliation

^[1] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo, SP - Brazil

^[2] Fed Inst Educ Sci & Technol Sao Paulo, Dept Phys, BR-01109010 Sao Paulo, SP - Brazil

^[3] Univ Fed Sergipe, Dept Phys, BR-49100000 Sao Cristovao, SE - Brazil

^[4] Univ Fed Reconcavo Bahia, Ctr Exact & Technol Sci, BR-44380000 Cruz Das Almas, BA - Brazil

• Document type: Journal article
• Source: Optical Materials; v. 108, OCT 2020.
• Web of Science Citations: 0

Abstract

Ceramic materials are low cost and have a good thermal and mechanic resistance which are suitable charac-teristics for a good dosimeter. A new Ca-doped MgAl2O4 ceramic material was produced by the first time by the laser sintering method. Thermoluminescence (TL) properties as a function of the exposure to ionizing radiation were investigated. X-ray diffraction of the sintered samples showed single crystalline phase corresponding to the cubic spinel structure. SEM images reveal the microstructure with homogenous and faceted grains and low porosity. TL readouts were performed with a linear heating rate were performed after irradiation with beta particles (doses ranging from 0.02 to 5 Gy). The TL glow-curve shows a single and wide peak centered at about 170 degrees C with a linear dose response, good repeatability (1%) and immediate fading that stabilizes after 16 h with 80% of the initial intensity. The lowest detectable dose (LDD) was also evaluated at 20 mu Gy. By applying the Tm-Tstop method to analyze the glow curve, it was found a behavior characteristic of closely overlapping or a quasi-continuum of peaks. Initial rise, peak shape of the TL glow curve, the TL glow curve area, and glow curve fitting methods were used to obtain the kinetic parameters of the glow peak. In general, the TL results suggest that this material might be used in dosimetric applications considering the studied dose range. (AU)

• FAPESP's process: 18/05982-0 - R&D&I in radiation metrology in the health area
• Grantee: Linda Viola Ehlin Caldas
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 19/05915-3 - Characterization of minerals for luminescent dosimetry of ionizing radiations
• Grantee: Neilo Marcos Trindade
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/16894-4 - Investigation of optically stimulated luminescence of alexandrite pellets for applications in the dosimetry area
• Grantee: Matheus Cavalcanti dos Santos Nunes
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 19/22375-2 - Study of kinetic parameters of thermoluminescent peaks of Al2O3:C,Mg
• Grantee: Juan Matheus Munoz
• Support Opportunities: Scholarships in Brazil - Scientific Initiation