Characterization of the optically stimulated luminescence (OSL) response of beta-irradiated alexandrite-polymer composites

Author(s)

Nunes, M. C. S. ^[1] ; Lima, L. S. ^[2] ; Yoshimura, E. M. ^[2] ; Franca, L. V. S. ^[3] ; Baffa, O. ^[3] ; Jacobsohn, L. G. ^[4] ; Malthez, A. L. M. C. ^[5] ; Kunzel, R. ^[6] ; Trindade, N. M. ^{[2, 1]}

Affiliation

^[1] Fed Inst Educ Sci & Technol Sao Paulo, Dept Phys, Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Inst Phys, Sao Paulo, SP - Brazil

^[3] Univ Sao Paulo, FFCLRP, Dept Phys, Ribeirao Preto, SP - Brazil

^[4] Clemson Univ, Dept Mat Sci & Engn, Clemson, SC - USA

^[5] Univ Tecnol Fed Parana, Dept Phys, Curitiba, PR - Brazil

^[6] Univ Fed Sao Paulo, Dept Phys, Diadema, SP - Brazil

• Document type: Journal article
• Source: Journal of Luminescence; v. 226, OCT 2020.
• Web of Science Citations: 0

Abstract

Alexandrite mineral (BeAl2O4:Cr3+) powder incorporated in a fluorinated polymer was prepared in the form of pellets. A mixture with 20 wt% of the alexandrite in the pellet had the luminescence behavior evaluated as a function of exposure to ionizing radiation using the optically stimulated luminescence (OSL) technique. The OSL measurements were evaluated in terms of dose-response (beta dose from 0.1 to 5 Gy), repeatability, reproducibility, and fading. The results showed that the OSL intensity signal varied linearly with the irradiation dose and that the OSL intensity suffered a strong reduction during the first five days of storage in the dark but remained stable for at least the following 30 days. Radioluminescence (RL) measurements under X-ray excitation revealed a weak luminescence within the ultraviolet-visible spectral region, while optical absorption (OA) measurements revealed the presence of Cr3+ impurities. (AU)

• 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: 18/05982-0 - R&D&I in radiation metrology in the health area
• Grantee: Linda Viola Ehlin Caldas
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 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