Radiosurgery dosimetry using OSL film made with CaSO4:Eu
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2022
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EUROPEAN CONGRESS ON RADIATION PROTECTION, 6th
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Recent studies demonstrated that optically stimulated luminescence (OSL) systems allow the
evaluation of doses for 2D mapping in a relatively fast and simple way and results show submillimeter
resolution (Ahmed et al., 2017; Jahn et al., 2013). The two most advanced-stage
studies with satisfactory application in 2D dose mapping are based on commercial prototype
detectors (Al2O3:C and BeO). Some OSL materials have been evaluated in research laboratories
for use in 1D and 2D dose distribution assessments and there is no common sense on
the best OSL material for each application (Yukihara and Kron, 2020). This work presents,
for the first time, an optically stimulated luminescence (OSL) film made with CaSO4:Eu particles
embedded in a silicone elastomer matrix. The OSL film was produced using a low-cost
and relatively simple methodology. This film is reusable and the signal can be satisfactorily
bleached using blue LEDs. The main dosimetric properties were evaluated using TL/OSL
Risoe reader with blue stimulation and Hoya U-340 filter. Investigation shows repeatability
within 5% when measuring with the same film sample. Regarding the OSL film homogeneity,
nearly 15% sensitivity change was observed within the 5 x 5 cm2 produced film. Additionally,
the dose response curve shows linearity from 5 to 25 Gy. Further studies are necessary
to understand and minimize the influence of OSL signal fading, which seems as high as 70%
in the first week and then is stable. Nevertheless, a 3 x 3 cm2 OSL film was successfully used
to map dose distribution in radiosurgery (6 MeV photon beam). This work demonstrates the
feasibility of 2D dosimetry using low-cost and reusable OSL films based on CaSO4:Eu.
Como referenciar
GASPARIAN, PATRICIA B.R.; MALTHEZ, ANNA L.M.C.; TORQUATO, MICHELE; CAMPOS, LETICIA L. Radiosurgery dosimetry using OSL film made with CaSO4:Eu: a feasibility study. In: EUROPEAN CONGRESS ON RADIATION PROTECTION, 6th, May 30 - June 3, 2022, Budapest, Hungary. Abstract... Budapest, Hungary: Akadémiai Kiadó, 2022. p. 169-169. Disponível em: http://repositorio.ipen.br/handle/123456789/33513. Acesso em: 28 Mar 2025.
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