Abstract
The method which used radiation for treating cancer’s patients has been common. The accuracy of dosimetry measurements is one important factor leads the radiation treatment be successful. Therefore, the aim of this work was to investigate and analyze a 10 MV photon beam characteristic produced by Elekta Synergy platform linear accelerator. Measurements of Percentage Depth Dose (PDD) and beam profiles for various field sizes were performed using a PTW motorized 3D therapy beam analyzer dosimetry system with two 0.125 cm3 Semiflex ionization chamber, 3D water phantom and MEPHYSTO mc2 from PTW. Measurements of Field Size Factor (FSF) and penetrative quality were performed using a PTW UNIDOS dosimeter with 0.6 cm3 ionization chamber. The results showed that the maximum percentage difference between measured data of PDD and data published in British Journal of Radiology supplement 25 was less than 5% for all field sizes up to depth of 20 cm while at depth greater than 20 cm the maximum percentage difference reaches 7.14%. Beam profiles characteristic, which are beam flatness, symmetry and penumbra width, were within tolerance limit of IEC and manufacturer specifications. Keywords: Synergy linac, commissioning, photon beam data, percent depth dose, beam profile, field size factor.