Investigation of optically stimulated luminescence of alexandrite pellets for applications in the dosimetry area

• Grant number: 18/16894-4
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2018
• End date: December 31, 2020
• Field of knowledge: Engineering - Nuclear Engineering - Applications of Radioisotopes
• Principal Investigator: Neilo Marcos Trindade
• Grantee: Matheus Cavalcanti dos Santos Nunes
• Host Institution: Instituto Federal de Educação, Ciência e Tecnologia de São Paulo (IFSP). Campus São Paulo. São Paulo , SP, Brazil

Abstract

Alexandrite has a chrysoberyl type structure with the incorporation of chromium in its lattice, chemical composition BeAl2O4: Cr3+ and contains around of 20 wt.% BeO and 80 wt.% Al2O3. Since these two oxides are commercially used as dosimeters, alexandrite has the potential to be a dosimeter too. Currently, Brazil one of the largest producers of this mineral. The objective of the research is to investigate the effects of beta ionizing radiation in alexandrite using Optically Stimulated Luminescence (OSL) technique. Preliminary results for alexandrite mineral presented a linear relationship of OSL intensity (stimulated with blue LEDs) as a function of beta dose, homogeneity in OSL results for different samples and low fading. In this work, it is proposed the development and characterization of natural alexandrite mineral pellets mixed with fluorinated polymer as a proposal for radiation detectors. The research will be conducted in collaboration with the University of Sao Paulo and Federal University of Technology - Parana.

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SILVA, G. P. S.; NUNES, M. C. S.; ULSEN, C.; KUNZEL, R.; YOSHIMURA, E. M.; TRINDADE, N. M.. Thermoluminescence of fluorapatite mineral. Journal of Luminescence, v. 231, MAR 2021. (19/05915-3, 18/16894-4, 19/15599-1)

NUNES, M. C. S.; LIMA, L. S.; YOSHIMURA, E. M.; FRANCA, L. V. S.; BAFFA, O.; JACOBSOHN, L. G.; MALTHEZ, A. L. M. C.; KUNZEL, R.; TRINDADE, N. M.. Characterization of the optically stimulated luminescence (OSL) response of beta-irradiated alexandrite-polymer composites. Journal of Luminescence, v. 226, OCT 2020. (19/05915-3, 18/05982-0, 18/16894-4)

TRINDADE, N. M.; MAGALHAES, M. G.; NUNES, M. C. S.; YOSHIMURA, E. M.; JACOBSOHN, L. G.. Thermoluminescence of UV-irradiated alpha-Al2O3 :C,Mg. Journal of Luminescence, v. 223, JUL 2020. (19/05915-3, 19/00942-2, 18/16894-4)

TRINDADE, N. M.; SILVA, E. P.; NUNES, M. C. S.; MUNOZ, J. M.; SANTOS, J. C. A.; YOSHIMURA, E. M.; SILVA, R. S.. Synthesis and thermoluminescence properties of MgAl2O4:Ca laser-sintered ceramics. Optical Materials, v. 108, OCT 2020. (18/05982-0, 19/05915-3, 18/16894-4, 19/22375-2)