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Alonso Sotolongo A, RIvera Montalvo T, Nolasco Altamirano D, López-Luke T, Contreras García ME, Zárate Medina J. Thermoluminescent glow curve of Gd 1-xRE xAlO 3 (RE=Dy or Pr) beta irradiated phosphors. Appl Radiat Isot 2023; 201:111019. [PMID: 37725890 DOI: 10.1016/j.apradiso.2023.111019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 08/15/2023] [Accepted: 09/05/2023] [Indexed: 09/21/2023]
Abstract
Phosphors composed of Gd1-xRExAlO3 (0≤x ≤ 5 RE = Dy or Pr) stoichiometries were synthesized using the reverse coprecipitation pathway. The thermoluminescent responses of all phosphors were studied under beta radiation exposure. Doping the gadolinium aluminate host improved the thermoluminescent response of the phosphors, with the phosphors composed of Gd0.99Dy0.01AlO3 and Gd0.95Pr0.05AlO3 being the most sensitive. The Dy3+ ions produced a higher improvement of the thermoluminescent signal than the Pr3+ ions. Additionally, a proportional relationship between the similarity of the atomic numbers of the dopant and replaced ions and the sensitivity to thermoluminescence was confirmed. Besides, a slight shift of the thermoluminescent peaks toward lower temperatures was detected for doped phosphors. In the repeatability tests applied to the phosphor composed of Gd0.99Dy0.01AlO3, an anomalous increase in sensitization was observed. The observed sensitization was associated with the formation of electron trap clusters resulting from the continuous exposure to beta radiation. Furthermore, another sensitization phenomenon was detected in the phosphor with Gd0.95Pr0.05AlO3 stoichiometry when it was heated at low temperatures. The aforementioned striking behavior was related to quasi-continuous distributions of electron traps and the tunneling effect. In regard to linearity, the phosphor composed of Gd0.99Dy0.01AlO3 exhibited a linear response with the dose across the entire range of beta doses. However, the response of the Gd0.95Pr0.05AlO3 phosphor lost linearity beyond 26.4 Gy of beta dose. The results obtained through the use of the Tmax-Tstop method and deconvolutions suggested an enhancement in the efficiency of the thermoluminescent mechanisms due to the incorporation of activators.
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Affiliation(s)
- Alejandro Alonso Sotolongo
- Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edif. "U", C.U., Morelia, 58060, Michoacan, Mexico.
| | - Teodoro RIvera Montalvo
- Instituto Politécnico Nacional, CICATA-Legaria, Legaria 694, Mexico City, 11500, Mexico City, Mexico.
| | - Daniel Nolasco Altamirano
- Instituto Politécnico Nacional, CICATA-Legaria, Legaria 694, Mexico City, 11500, Mexico City, Mexico.
| | - Tzarara López-Luke
- Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edif. "U", C.U., Morelia, 58060, Michoacan, Mexico.
| | - María Eugenia Contreras García
- Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edif. "U", C.U., Morelia, 58060, Michoacan, Mexico.
| | - Juan Zárate Medina
- Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edif. "U", C.U., Morelia, 58060, Michoacan, Mexico.
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