TL characterization of Ag co-doped SrSO 4 :Eu phosphor for gamma dosimetry applications
| Autor: | V.M. Anandakumar, C.M.K. Nair, T.S. Elias, K. Madhukumar, S. Rajesh, Resmi G. Nair, S. Jayasudha |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Dopant Biophysics Analytical chemistry Mineralogy Phosphor 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Thermoluminescence Atomic and Molecular Physics and Optics 0103 physical sciences Orthorhombic crystal system Thermoluminescent dosimeter Crystallite 0210 nano-technology Luminescence Powder diffraction |
| Zdroj: | Journal of Luminescence. 184:136-142 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2016.12.016 |
| Popis: | High temperature thermoluminescence (TL) emissions and improvement in fading due to the co-doping ofr Ag in the SrSO4:Eu phosphor synthesized through chemical precipitation technique when subjected to γ-excitation is discussed. The dopant concentrations were tuned for optimum TL sensitivity. Preliminary crystallographic and structural studies of the phosphors were done using PXRD, SEM, and TEM. The phosphor has a single phase orthorhombic lattice structure and the crystallites are found to be nanostructured. The presence of dopants in the host matrix is established through EDS and ICP-AES studies. The TL glow curve shows a single intense emission at 314 ⁰C under γ- exposure of dose 1 Gy, which is given from a 60Co build-up. The dosimetric properties such as sensitivity, dose dependence, fading and reusability of SrSO4:Eu,Ag phosphor were also studied. It is observed that co-doping with Ag improves the fading rate of the SrSO4:Eu phosphor by about 5%. Even though the luminescence intensity is found to be less than that of SrSO4:Eu phosphor, the Ag co-doped phosphor becomes significant owing to its improved fading rate and high temperature afterglow. The gamma sensitivity of the SrSO4:Eu,Ag(0.5,0.5 mol%) phosphor is compared to that of the standard CaSO4:Dy TLD phosphor. The TL kinetic parameters were calculated using IR, Chen's peak shape method and verified by the theoretical fit using GCD functions. |
| Databáze: | OpenAIRE |
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