| Full text | |
| Author(s): |
Guilheiro, J. M.
[1]
;
Tatumi, S. H.
[1, 2]
;
Soares, A. de F.
[2]
;
Courrol, L. C.
[3]
;
Barbosa, R. F.
[1]
;
Rocca, R. R.
[1]
Total Authors: 6
|
| Affiliation: | [1] Univ Fed Sao Paulo, Dept Ciencias Mar, Campus Baixada Santista, Santos, SP - Brazil
[2] Univ Sao Paulo, Dept Engn Elect, Escola Politecn, Sao Paulo, SP - Brazil
[3] Univ Fed Sao Paulo, Dept Fis, Campus Diadema, Diadema, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Journal of Luminescence; v. 233, MAY 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
The present study shows morphological characterization, experimental results, theoretical fittings of TL and OSL curves of yellow calcite and the correlation between these emissions. The OSL of the sample raises with dose and was theoretically decomposed into three components with a lifetime span of 0.5, 10, and 28 s. TL peaks at 90 and 126 degrees C were observed in UV region and they could be correlated with OSL emission; these peaks were deconvoluted using general order kinetic theory (GOK) they supplied an activation energy (E) values of 0.7 and 1.0 eV and kinetic order (b) of 1.2 and 2.0 respectively. Both peaks presented good response with beta irradiation in the range between 5 and 41 Gy. TL glow curve recorded at VIS-UV region showed 4 peaks, after deconvolution applying GOK, the peaks temperatures were determined at 92.9, 118.9, 155 and 452 degrees C; with E equal 0.7, 0.8, 1.3, and 1.05 eV, and b equal 1.01, 1.30, 2.00, and 1.70, respectively. In addition, photoluminescence (PL) spectra were carried out with excitation at 350 nm and the calcite exhibited four broad bands at 413, 440, 470, and 486 nm, and a small one at 390 nm, which can be associated with oxygen vacancies and Me-O defects. The PL results was converted to CIE (Commission International deI'Eclairage) and the coordinates color of the phosphors were determined, values x = 0.14959, y = 0.11,775 (blue) for non-irradiated sample, and x = 0.14593, y = 0.05921 (purplish blue) to irradiated one. (AU) | |
| FAPESP's process: | 09/02069-2 - Deployment and development of methodology for single-grain dating by optically stimulated luminescence |
| Grantee: | Sonia Hatsue Tatumi |
| Support Opportunities: | Regular Research Grants |