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Characterization of minerals for luminescent dosimetry of ionizing radiations

Grant number: 19/05915-3
Support type:Regular Research Grants
Duration: October 01, 2019 - September 30, 2021
Field of knowledge:Engineering - Mining Engineering - Mineral Prospecting
Principal Investigator:Neilo Marcos Trindade
Grantee:Neilo Marcos Trindade
Home Institution: Instituto Federal de Educação, Ciência e Tecnologia de São Paulo (IFSP). Campus São Paulo. São Paulo , SP, Brazil
Assoc. researchers:Elisabeth Mateus Yoshimura

Abstract

The project provides for the study of Brazilian minerals for application in radiation dosimetry. Because of the natural samples, the determination of the optical absorption spectrum (OA) is important to allow a correlation between the absorption ions present in the mineral and the effects observed before and after irradiation. Therefore, this project suggests the acquisition of an Optical Absorption Spectrometer in the UV-Vis region. In this project, in addition to the investigations proposed by spectroscopic measurements, usual laboratory techniques such as Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) will be used. The first material of interest is alexandrite (BeAl2O4: Cr3 +), chrysoberyl variety widely found in Brazil; however, it is still a little known gem as to its physical properties. In general, the objective of this work is to investigate the presence of Cr3 + and Fe3 + ions in alexandrite, in addition to other elements and phases, and how much they influence the optical properties, mainly regarding optical absorption and luminescent response; and the feasibility for dosimetric material. Recently, the investigation of natural minerals of alexandrite showed that the TL and OSL signal increases linearly as a function of the dose (ionizing radiation beta), therefore, alexandrite has shown potential for use in dosimetry. Still considering its luminescent properties, and that Brazil is currently the world's largest producer of alexandrite, this project also proposes the characterization of detectors in the format of pellets containing alexandrite and a binder. The research will be conducted in collaboration with the University of São Paulo. (AU)

Matéria(s) publicada(s) na Agência FAPESP sobre o auxílio:
Aluminum oxide crystal tested as a UV radiation sensor 
Articles published in other media outlets (15 total):
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Comercial Pyramon Studio Light Ltda: Brasileiros desenvolvem cristal que mede radiação UV (07/Dec/2020)
Technology Networks (Reino Unido): Doped Aluminum Oxide Shows Promise as a UV Radiation Detector (05/Jun/2020)
Phys.Org (Reino Unido): Aluminum oxide crystal tested as a UV radiation sensor (03/Jun/2020)
Technology Networks (Reino Unido): Doped Aluminum Oxide Shows Promise as a UV Radiation Detector (03/Jun/2020)
AZoSensors (Reino Unido): Carbon-Doped Aluminum Oxide Could Serve as UV Radiation Sensor (03/Jun/2020)
Occupy Independents (EUA): Aluminum Oxide Crystal Tested As A UV Radiation Sensor (03/Jun/2020)
News Medical (Austrália): Researchers test aluminum oxide crystal as a UV radiation sensor (02/Jun/2020)
Bioengineer (Reino Unido): Aluminum oxide crystal tested as a UV radiation sensor (02/Jun/2020)
Science Codex: Aluminum oxide crystal tested as a UV radiation sensor (02/Jun/2020)
Scienmag Science Magazine (Reino Unido): Aluminum oxide crystal tested as a UV radiation sensor (02/Jun/2020)
7thSpace: Aluminum oxide crystal tested as a UV radiation sensor (02/Jun/2020)
Knowledia (França): Researchers test aluminum oxide crystal as a UV radiation sensor (02/Jun/2020)
Inovação Tecnológica: Brasileiros desenvolvem cristal que mede radiação UV (29/Apr/2020)
Espaço Ecológico no Ar: Cristal de óxido de alumínio é testado como sensor de radiação UV (29/Apr/2020)
Revista Analytica online: Cristal de óxido de alumínio é testado para uso como sensor de radiação de UV (28/Apr/2020)

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)
TRINDADE, N. M.; CRUZ, M. R.; YOSHIMURA, E. M. Correlation between thermoluminescence and optically stimulated luminescence responses of natural alexandrite. Applied Radiation and Isotopes, v. 166, DEC 2020. Web of Science Citations: 0.
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. Web of Science Citations: 0.
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. Web of Science Citations: 0.
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. Web of Science Citations: 0.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.