Angular characterization of the response of an YVO4:Eu3+ - based radioluminescence probe under LINAC irradiation

MARCAZZÓ JULIÁN; MARTINEZ NAHUEL; MOLINA PABLO; FERNÁNDEZ JOHANNA; SANTIAGO MARTÍN

Santo Domingo

Congreso; XVII Internacional Symposium on Solid State Dosimetry ISSSD 2017; 2017

ISSSD

Real-time dosimetry in radiotherapy with high spatial resolution is a constantly growing research field. Accurate radiotherapy techniques such as, gynaecological brachytherapy, intensity-modulated radiation therapy, intraoperative radiation therapy, stereotactic radiosurgery, among others, require dosimeters with the characteristics mentioned before. Even though different kinds of detection systems have been investigated to perform in-vivo dosimetry, most of them do not provide simultaneously spatial resolution, real-time dose assessment and intracavitary measurements. The so-called fiberoptic dosimetry (FOD) technique has shown to meet most of these requirements mostly needed in radiotherapy [1].This technique is based on the use of a tiny piece of a scintillation crystal, which is attached at the end of an optical fiber [1]. The fiber collects the light emitted by the scintillator during irradiation (radioluminescence, RL) and a light detector placed at the other extreme of the optical fiber measures its intensity. FOD technique allows for in-vivo and real-time dose assessment, and due to the small size of the detector it not only permits accurate measurements in regions of high dose gradients but also intracavitary measurements [2].Martinez et al. [3] observed angular dependency of the scintillating signal when cylindrical detectors are employed as usual in this technique. In the present work we report the angular response of an YVO4:Eu3+ based FOD probe. YVO4:Eu3+ powder was dispersed in UV curing adhesive to obtain a 2 mm diameter spherically shaped detector, which was glued at the end of an optical fiber.