Dosimetry of Absolute Dose to Water From Elekta Synergy Platform Linear Accelerator Using Clinical Electron Beam

The use of electron beams in external beam radiation therapy started in 1930 but was limited to very few medical centers due to manual calculations of dose. The development of Van de Graaff generators, Betatrons, and various generations of commercial linear accelerators led to Elekta Synergy platform linear accelerators which were capable of performing dose calculations using computer software. In the present paper, we present a study on dose calculations for electron energies in the range of 4-15 MeV. This study was pursued following the recommendations of the International Commission on Radiation Units and Measurements (ICRU) and International Atomic Energy Agency (IAEA) reports and protocols of the International code of practice TRS-381. It is based on an experimental setup using a radiation field analyzer (RFA). This comprises of PTW-Freiburg Parallel plate ionization chamber (waterproof with cap, Model TM 23343) with a sensitive volume of 0.055 cm3 and a semi-flex chamber (waterproof with cap, Model TM 30010) with a sensitive volume of 0.125 cm3 both coupled with a digital electrometer (PTW UNIDOSE). The measurements were performed on a linear accelerator (Make & Model: ELEKTA, Synergy Platform)