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Avaliação do tempo de tratamento óptico para dosímetros Al2O3:C utilizando LED azul e branco

Authors: Pereira,Beatriz Hellen Aparecida; Barros,Cássia Eugênia; Alves, Arthur de Souza Borges Zuchetti; Oliveira, Amanda Bravim de; Perini, Ana Paula; Neves, Lucio Pereira;

Avaliação do tempo de tratamento óptico para dosímetros Al2O3:C utilizando LED azul e branco

Abstract

Considerando que procedimentos radiológicos são a principal forma em que a população é exposta à radiação artificial, torna-se imprescindível o desenvolvimento e aperfeiçoamento de técnicas dosimétricas. Uma dessas técnicas é a dosimetria opticamente estimulada (LOE). Neste trabalho serão usados dosímetros LOE a fim de se avaliar qual conjunto tempo/LED é mais eficiente em apagar o sinal residual das pastilhas após elas serem usadas para dosimetria. Foram utilizados 40 dosímetros de óxido de alumínio dopado com carbono, os quais passaram por irradiação no Hospital do Câncer de Uberlândia. As leituras foram realizadas com a leitora LOE desenvolvida pela Universidade Federal do Pernambuco, e posteriormente tratados com lâmpadas de LED nas cores azul e branco frio. Nas pastilhas tratadas com a luz azul, notou-se que o menor sinal residual ocorreu em 45 minutos de tratamento e depois disso foi apresentada pouca variação até os 60 minutos. Para as pastilhas tratadas com a luz branca, o menor sinal residual ocorreu em 35 minutos de tratamento. Em relação a porcentagem de resposta, o último conjunto apresentou resultado 0,3% menor, sendo então o mais eficiente. Entretanto, os dosímetros tratados com a luz branca apresentaram flutuações nas porcentagens de resposta, não possuindo uma linearidade, sendo esse comportamento atribuído a como a luz branca é produzida, sendo uma junção de comprimentos de onda azuis e amarelos.

Keywords

luminescência opticamente estimulada, radiação, Proteção radiológica, tratamento óptico, dosimetria

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This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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