Study of radioluminescence from CaSO4:Eu films for real-time dosimetry
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2023
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INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th
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Active detectors based on semiconductors and diodes are largely applied for clinical dosimetry,
however they present limitations mainly related to complex electronic structure, limited spatial resolution
and high cost. Several materials which exhibit thermoluminescence (TL) and optically stimulated
luminescence (OSL) also present radioluminescence (RL), as Al2O3:C,Mg. In principle, RL materials can be
used in real-time dosimetry as active detectors if the intensity of the RL signal can be associated with the
absorbed dose. The sensitive material can be coupled to optical fibers, CCD devices, or other device to
collect its light emission. The phosphor CaSO4:Eu has been studied as TL and OSL detector and literature
reports good reproducibility, linear dose-response and negligible fading. Previously, CaSO4:Eu OSL films
were produced and applied for two-dimensional dose mapping in radiotherapy. Considering the potential
application of CaSO4:Eu films for medical applications, in this work we studied the RL emission of
CaSO4:Eu films. Firstly we used a Horiba Absorbance and Fluorescence Spectrometer, model Duetta, and
obtained the emission spectra of the CaSO4:Eu films, exciting with different wavelenghts and observed two
emission centre groups. The first group is at 385 nm, related to Eu2+ and the second group, related to
Eu3+ is at 580 nm, 600 nm and 700 nm. Secondly, to study the RL emission from the CaSO4:Eu film, we
used a custom made equipment named LUMI22, which has an X-ray tube (Moxtek 50kV) powered and
controlled by a standard controller (FTC-200) to irradiate the samples, and a miniature fiber optic
spectrometer (Ocean Optics, FLAME-S-XR1-ES) that is used to identify the wavelength of the emitted light
(range 200-1050 nm). Results showed a radioluminescent peak at 390 nm, which should be related to Eu2+.
The RL sensitivity is (46.1 ± 1.3) 103 counts/Gy. The film does not need thermal or optical treatment and
the radioluminescent peak is reproducible. Comparing the RL intensity after 10 consecutive irradiations
with the same conditions, the maximum coeficient of variation is 2.5%. The dose response of the RL is
linear (R-square 0.9959) from 0.04 to 0.3 Gy. Results show that the CaSO4:Eu film is promissing for use
with the RL technique in real-time clinical dosimetry. It should be possible to evaluate dose distributions in
real time using the film and a reader with several fiber optics, for example.
Como referenciar
GASPARIAN, PATRICIA B.R.; MALTHEZ, ANNA L.M.C.; CAMPOS, LETICIA L.; TRINDADE, NEILO M.; OLIVEIRA, ALDO R. de; MARTINS, ROBERTO T.E.K. Study of radioluminescence from CaSO4:Eu films for real-time dosimetry. In: INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th, September 17-22, 2023, Viareggio, Italy. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/47982. Acesso em: 09 May 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.