| Texto completo | |
| Autor(es): |
Trindade, Neilo Marcos
[1, 2]
;
da Cruz, Marcela Rodrigues
[3]
;
Kahn, Henrique
[4]
;
Jacobsohn, Luiz Gustavo
[1]
;
Yoshimura, Elisabeth Mateus
[3]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [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
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Luminescence; v. 206, p. 455-461, FEB 2019. |
| Citações Web of Science: | 0 |
| Resumo | |
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) | |
| Processo FAPESP: | 17/11663-1 - Estudo de um novo detector natural para aplicações na área de saúde e indústria |
| Beneficiário: | Neilo Marcos Trindade |
| Modalidade de apoio: | Bolsas no Exterior - Pesquisa |