Performance of ZnSe(Te) as fiberoptic dosimetry detector

MARCELA RAMÍREZ; NAHUEL MARTÍNEZ; JULIÁN MARCAZZÓ; PABLO MOLINA; DIANA FELD; MARTIN SANTIAGO

APPLIED RADIATION AND ISOTOPES

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2016

0969-8043

Fiberoptic dosimetry (FOD) is an experimental technique suitable for in vivo, real time dosimetry in radiotherapy treatments. FOD relies on using a small scintillator coupled to  one end of a long optical fiber. The scintillator is placed at the  point where the dose rate is to be determined whereas a light detector at the other end of the fiber measures the intensity of  the radioluminescence emitted by the scintillator. One of the  problems hampering the straightforward application of this  technique in clinics is the presence of Cherenkov radiation generated in the fiber by the ionizing radiation, which adds to  the scintillating light and introduces a bias in the dose measurement. Since Cherenkov radiation is more important in short wavelength range of the visible spectrum, using red emitting scintillators as FOD detectors permits to reduce the  Cherenkov contribution by using optical filters. In this work, the performance of red emitting tellurium doped zinc selenide crystal as FOD detector is evaluated and compared to the response of an ion chamber.