Analysis of the suitability of a scintillation detector LSO for clinical dosimetry
Yagnyukov S. A.1, Lebedeva J. S.1, Blitman D. M.2, Yurasova O. V.2
1Pavlov First St. Petersburg State Medical University, St. Petersburg, Russia
2Federal State Research and Development Institute of Rare Metal Industry (Giredmet JSC), Moscow, Russia
Email: seomcka.seom@yandex.ru, zhanna-med.phys@mail.ru, DMBlitman@rosatom.ru, ovyurasova@rosatom.ru
The possibility of using scintillation detectors based on LSO crystals (Lu2SiO5:Ce) for the tasks of clinical dosimetry in radiotherapy. A computer simulation of the process of photon generation and registration in a scintillation detector in the Geant4 program has been performed, and optimal crystal parameters (length 10-15 mm for photon energy 1.25-7.5 MeV) have been determined. An experimental test of the prototype detector in a water phantom at the Varian Unique accelerator revealed its advantages (spatial resolution comparable to that of the Sun Nuclear EDGE semiconductor detector) and disadvantages (sensitivity to illumination, nonlinear dependence on radiation power). The results confirm the possibility of using scintillators in dosimetry, however, existing detectors have an advantage due to the smaller thickness of the detector and, consequently, less influence on the uniformity of the radiation flux. Keywords: clinical dosimetry, scintillator, computer simulation, experimental verification.
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- Electron accelerator Varian Unique: 8.910 https://www.varian.com/en-ca/products/radiotherapy/treatment -delivery/unique
- Water phantom Sun Nuclear 3D SCANNER: https://www.sunnuclear.com/products/3d-scanner
- Clinical dosimeter Dose-1: https://universalenterprisespk.com/medical-equipment/iba-dosimetry-dose01-brochure.pdf
- Semiconductor detector Sun Nuclear EDGE: https://www.sunnuclear.com/products/edge-detector
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