First LM-OSL analysis of natural alexandrite

Author(s)

Amorim, Yasmim F. ; Nunes, Matheus C. S. ; Chruscinska, Alicja ; Winiewski, Krzysztof ; Trindade, Neilo M.

• Document type: Journal article
• Source: Radiation Measurements; v. 184, p. 8-pg., 2025-04-27.

Abstract

Linearly Modulated Optically Stimulated Luminescence (LM-OSL) analysis of alexandrite in powder form and incorporated with a polymer matrix was performed in order to investigate the components of its curves. LM-OSL curves were deconvoluted into four first-order components, and the behavior of their intensities revealed two traps' pairs: super-fast component and fast component, and medium component and slow component, responsible for the LM-OSL signal of powder alexandrite. The thermal stability test showed that after 100 degrees C of preheat temperature, the super-fast component of alexandrite pellet vanishes. A luminescence spectrum collected under 470 nm stimulation indicated a photoluminescence process, suggesting electrons excitation can cause disturbance in OSL process when the luminescence is stimulated with blue LEDs due to its high energy photons. (AU)

• FAPESP's process: 18/05982-0 - R&D&I in radiation metrology in the health area
• Grantee: Linda Viola Ehlin Caldas
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 24/20645-0 - Trap Characterization in Alexandrite Using Variable Energy of Stimulation (VES-OSL)
• Grantee: Yasmim Freire Amorim
• Support Opportunities: Scholarships abroad - Research Internship - Scientific Initiation
• FAPESP's process: 23/18315-0 - Synthesis and characterization of Al2O3:C,Mg for application in luminescence dosimetry.
• Grantee: Matheus Cavalcanti dos Santos Nunes
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 22/14516-8 - Study of mechanisms of luminescence in alexandrite pellets using optically stimulated luminescence
• Grantee: Matheus Cavalcanti dos Santos Nunes
• Support Opportunities: Scholarships abroad - Research Internship - Master's degree
• FAPESP's process: 21/12758-1 - Development and characterization of an optically stimulated luminescent detector based on natural Brazilian alexandrite
• Grantee: Matheus Cavalcanti dos Santos Nunes
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 22/06690-8 - Investigation of optically stimulated luminescence (OSL) of alexandrite pellets previously exposed to X-rays.
• Grantee: Yasmim Freire Amorim
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 19/05915-3 - Characterization of minerals for luminescent dosimetry of ionizing radiations
• Grantee: Neilo Marcos Trindade
• Support Opportunities: Regular Research Grants