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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Thermoluminescence and radioluminescence of alexandrite mineral

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Trindade, Neilo Marcos [1, 2] ; da Cruz, Marcela Rodrigues [3] ; Kahn, Henrique [4] ; Jacobsohn, Luiz Gustavo [1] ; Yoshimura, Elisabeth Mateus [3]
Total Authors: 5
[1] Clemson Univ, Dept Mat Sci & Engn, Clemson, SC - USA
[2] Fed Inst Educ Sci & Technol Sao Paulo IFSP, Dept Phys, Sao Paulo, SP - Brazil
[3] Univ Sao Paulo, Inst Phys, Sao Paulo, SP - Brazil
[4] Univ Sao Paulo, Polytech Sch, Sao Paulo, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of Luminescence; v. 206, p. 455-461, FEB 2019.
Web of Science Citations: 0

The thermoluminescence (TL) of natural alexandrite (BeAl2O4) was investigated using different methods, namely T-m-T-stop, T-m as a function of beta irradiation dose, glow curve best fitting, variable heating rate, and TL fading as a function of time after irradiation, in addition to radioluminescence (RL) measurements under X-ray excitation as a function of the temperature. The chemical composition and the concentration of secondary mineral phases were determined by scanning electron microscopy and Energy-dispersive X-ray spectroscopy. TL measurements with heating rate = 1 K/s revealed five individual TL peaks at about 355 (peak I), 405 (peak II), 435 (peak III), 530 (peak IV), and 580 K (peak V). The activation energy E and the frequency factor s associated with each of them were determined by different methods. Within irradiation doses from 1 to 10 Gy, analysis of the T-m position indicated that all glow peaks exhibited a first-order kinetics TL mechanism. TL fading at room temperature was 15% for peak IV and 5% for peak V within 2 days after irradiation. RL measurements revealed luminescence centers attributed to Cr3+, Mn4+ and Fe3+ impurities. Overall, the results suggest that natural alexandrite has a potential use in dosimetry. (AU)

FAPESP's process: 17/11663-1 - Study of a new natural detector for applications in the health and industry field
Grantee:Neilo Marcos Trindade
Support Opportunities: Scholarships abroad - Research