Assessment of the a new dosimeter "Sugar / EPR" response depending on the delivered dose by a beam used in radiotherapy

Abstract

Radiotherapy is the treatment of cancers using  ionizing radiations. Its goal is to sterilize cancerous tumors without overdosing surrounding healthy tissues. Its success is based on precision during all stages of treatment especially through the dosimetry wich is the unique mean to mesure the delivred dose to the patients. The prescision and the quality of the dosimetric mesures are based on the use of a reliable and accurate dosimeter. The aim of our work was to highlight the dosimetric properties of the new dosimetric system "sugar / EPR" irradiated by a X18MV photon beam from a linear accelerator « Clinac 2100C » and analysed by EPR spectometer in order to develop its application in radiotherapy. The study includes phases of identification the EPR spectrum produced by the irradiation of sugar, and determination of the sugar / EPR response depending on the delivered doses, its calibration curve, its sensitivity and its limit of detection with respect to X18MV photons. The obtained results were importants and were in good agreement with the literature showing the potential of the dosimetric system "sugar / EPR" for a promising use in radiotherapy, and finally, they allow us to conclude that it could be used as an alternative to enhance the accuracy of dosimetry in external radiotherapy.