September 29, 2022 to October 2, 2022
Kraków
Europe/Warsaw timezone

Development of composite TL and OSL materials for analyzation of dose and energy of photons beam for radiotherapeutic applications

Oct 2, 2022, 8:45 AM
15m
sala A (budynek D-10)

sala A

budynek D-10

Prezentacja ustna Radioterapia Radioterapia

Speaker

Prof. Yuriy Zorenko (Kazimierz Wielki University in Bydgoszcz)

Description

Thermostimulated (TSL) and optically stimulated (OSL) luminescent dosimetry are a versatile tools for the assessment of ionizing radiation dose.
For control of photon beam dose distributions in radiotherapy, we used the non-conventional TSL detectors with 10100.5mm size prepared from the Czochralski grown crystals of Ce3+ doped garnets with different density ρ and effective atomic number Zeff: “light” Y3Al5O12:Ce (YAG:Ce); ρ=4.5g/cm3; Zeff=35, and “heavy” Lu3Al5O12:Ce (LuAG:Ce);ρ= 6.7g/cm3; Zeff=61 and Gd3Al3Ga3O12 (GAGG:Ce), ρ=6.6 g/cm3; Zeff= 54. The detectors were irradiated with 6MV and 15MV X Rays using linear accelerator Clinac 2300C/D from Varian Medical Systems at Oncology Center in Bydgoszcz.
We have found that YAG:Ce crystals is suitable TSL material for application with 6MV photon beams due to high intensity TSL response at typical therapeutic dose of 2 Gy and good position of main TSL peak at 290K[2]. However, for at the registration of X rays with the high energy (15 MV), much heavy LuAG:Ce and GAGG:Ce TSL detectors can be applied. Furthermore, the creation of multilayered composite TSL detectors based on the YAG:Ce film and LuAG:Ce/or GAGG:Ce crystals were considered using LPE growth method [3].
Another approach in the development of the composite detectors is connected with efficient OSL properties of GAGG:Ce[4] and YAG:Ce crystals [5]. The creation of YAG:Ce/GAGG:Ce composite OSL detectors can be even more prospective than their TSL counterparts. Similarly to composite scintillators [6], the registration of the signal coming from film and crystal parts of composite detector can be realized using differences in their OSL decay kinetic.

Sesja Radioterapia

Primary authors

Janusz Winiecki (Centrum Onkologii w Bydgoszczy) Prof. Yuriy Zorenko (Kazimierz Wielki University in Bydgoszcz) Ms Paulina Michalska Dr Witkiewicz Witkiewicz-Lukaszek

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