Dosimetric characterization of high-linearity bone radiation detector exposed to gamma-rays
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2019
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INTERNATIONAL CONFERENCE ON DOSIMETRY AND ITS APPLICATIONS, 3rd
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Introduction
In radiation physics, the study of new alternative dosimeters is of interest on the growing
branch of dosimetric characterization of solid-state dosimeters for radiotherapy applications
in the Medical Physics fi elds. There are innumerous emerging techniques for reading and
processing multivariate data to assess the possible linear behavior of dosimeters; such methods
are the multivariate calibration Partial Least Square Regression (PLSR) and Principle Component
Regression (PCR) techniques. The goal of this work was to expose bone samples to high doses
and to use the FTIR spectrophotometry technique to evaluate the sensitivity and linearity of
the absorbed profi les using PLSR and PCR analyses.
Methods
Small cubes with size approximately of 0.5 cm3 composed the bone samples, used in this work.
The samples were irradiated in triplicates, with absorbed doses of 10, 100, 250, 400 and 500
Gy using a 60Co Gamma Cell-220 system (dose rate of 1.089 kGy/h); afterwards, the absorbance
spectrum of each sample was acquired on a Fourier Transform Infrared (FTIR) Spectrometer
(Frontier/Perkin Elmer) with an optical step of 1 nm from 400 nm to 4000 nm.
Results
The absorbance for high sensitivity peaks was observed for each bone sample, at the 552 nm,
991 nm and 1650 nm wavelengths in decreasing magnitude. The PLSR and PCR techniques
showed, on the range from 10 Gy to 500 Gy, for the calibration curves of the system, a linearity
of 0.9432 and 0.9422 respectively, using just three components on both methods.
Conclusions
The results indicate an acceptable linear response, and therefore this material may be an
interesting radiation detector.
Como referenciar
OLIVEIRA, LUCAS N. de; NASCIMENTO, ERIBERTO O.; MORAIS JUNIOR, PEDRO A.; ANTONIO, PATRICIA L.; CALDAS, LINDA V.E. Dosimetric characterization of high-linearity bone radiation detector exposed to gamma-rays. In: INTERNATIONAL CONFERENCE ON DOSIMETRY AND ITS APPLICATIONS, 3rd, May 27-31, 2019, Lisboa, Portugal. Abstract... Lisboa, Portugal: C2TN, Instituto Superior Técnico, Universidade de Lisboa, 2019. Disponível em: http://repositorio.ipen.br/handle/123456789/31017. Acesso em: 25 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.