Study of a new natural detector for applications in the health and industry field

• Grant number: 17/11663-1
• Support type: Scholarships abroad - Research
• Effective date (Start): October 01, 2017
• Effective date (End): July 31, 2018
• Field of knowledge: Engineering - Nuclear Engineering - Applications of Radioisotopes
• Principal researcher: Neilo Marcos Trindade
• Grantee: Neilo Marcos Trindade
• Host: Luiz Gustavo Jacobsohn
• Home Institution: Instituto Federal de Educação, Ciência e Tecnologia de São Paulo (IFSP). Campus São Paulo. São Paulo , SP, Brazil
• Research place: Clemson University, United States

Abstract

Alexandrite has a chrysoberyl type structure with the incorporation of chromium in its lattice, chemical composition BeAl2O4: Cr3+. Currently, Brazil one of the largest producers of this mineral. However, there are still few studies about the physical properties of natural alexandrite. This material has been important technologically as a laser in medical applications, mainly in the area of dermatology and cancer treatment, with superior properties to its main competitors, ruby and Nd: YAG lasers. The objective of the research is to investigate the effects of ionizing radiation (X-rays, beta and gamma) and UV light in alexandrite using Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) techniques. Preliminary studies show that alexandrite exhibits low intensity TL peaks at 110, 160 and 280C and a dominant peak at 350C. Unprecedented results that we obtained from OSL show an intense signal even at low doses of radiation. It is believed that impurities, especially Cr3+ and Fe3+, play an important role in these characteristics. It is proposed to carry out characterizations such as TL and OSL, as well as other characterizations that are necessary, as well as to investigate the applicability of these materials in dosimetry and a future patent. The research will be conducted at the Department of Materials Science and Engineering at Clemson University, USA. (AU)

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

TRINDADE, NEILO MARCOS; METIDIERI CRUZ MALTHEZ, ANNA LUIZA; NASCIMENTO, AUGUSTO DE CASTRO; DA SILVA, RONALDO SANTOS; JACOBSOHN, LUIZ GUSTAVO; YOSHIMURA, ELISABETH MATEUS. Fabrication and characterization of a composite dosimeter based on natural alexandrite. Optical Materials, v. 85, p. 281-286, NOV 2018. (17/11663-1)

TRINDADE, NEILO MARCOS; JACOBSOHN, LUIZ GUSTAVO; YOSHIMURA, ELISABETH MATEUS. Correlation between thermoluminescence and optically stimulated luminescence of alpha-Al2O3:C,Mg. Journal of Luminescence, v. 206, p. 298-301, FEB 2019. (17/11663-1)

TRINDADE, NEILO MARCOS; JACOBSOHN, LUIZ GUSTAVO. Thermoluminescence and radioluminescence of alpha-Al2O3:C,Mg at high temperatures. Journal of Luminescence, v. 204, p. 598-602, DEC 2018. (17/11663-1)

TRINDADE, NEILO MARCOS; DA CRUZ, MARCELA RODRIGUES; KAHN, HENRIQUE; JACOBSOHN, LUIZ GUSTAVO; YOSHIMURA, ELISABETH MATEUS. Thermoluminescence and radioluminescence of alexandrite mineral. Journal of Luminescence, v. 206, p. 455-461, FEB 2019. (17/11663-1)