Characterization of YVO4:Eu3+ scintillator as detector for Fiber Optic Dosimetry. (November 2017)

• Record Type: Journal Article
• Authors: Martínez, N.; Rucci, A.; Marcazzó, J.; Molina, P.; Santiago, M.; Cravero, W.
• Is Part Of: Radiation measurements. Volume 106(2017:Nov.)
• Page Start: 650
• Page End: 656
• Publication Date: 2017-11
• Subjects: Insert; Nuclear emulsions -- Periodicals; Particle tracks (Nuclear physics) -- Periodicals; Thermoluminescence -- Periodicals; Cosmic rays -- Periodicals; Radiation -- Measurement -- Periodicals; Radiometry -- Periodicals; Radiation Monitoring -- Periodicals; Émulsions nucléaires -- Périodiques; Particules (Physique nucléaire) -- Traces -- Périodiques; Thermoluminescence -- Périodiques; Rayonnement cosmique -- Périodiques; Radiométrie -- Périodiques; 539.77
• DOI: 10.1016/j.radmeas.2017.03.015
• Languages: English
• ISSNs: 1350-4487

Abstract

Abstract: Fiberoptic dosimetry (FOD) is an experimental technique suitable for in-vivo, real time dosimetry in radiotherapy treatments. In a previous work it was found that YVO4 :Eu is a scintillator suitable to be employed as scintillator for FOD in pulsed MV photon beams. YVO4 :Eu-based FOD probes have shown several positive characteristics: temperature independence; no previous irradiation needed; good spatial resolution. In this paper others dosimetric characteristics have been investigated for the first time. Suitability for real time dosimetry has been determined by simultaneous measurement with a ionization chamber; off axis profile have been obtained in order to assess spatial resolution of the FOD system when used in fields having a size of 3 × 3cm 2 and 1 × 1cm 2 ; angular dependence has been studied for probes with cylindrical and quasi-spherical geometry showing the influence of the detector shape on it isotropy. Additionally, PDD curves resulting from Monte Carlo simulations have been successfully compared to experimental curves. Highlights: YVO4 :Eu-based dosimetric probes are suitable for real time dosimetry. YVO4 :Eu response shows repeatability and independence with accumulated dose within therapeutic range. Isotropic response is observed if the detector is spherically shaped.