Determination and comparison of the output dose of electrons in 15, 18, 21 mev energy using dosimeter systems in radiotheraphy based on linac

In this study, output dose measurements at different measurement systems of GE Saturne 43 Linear Accelerator with energy electron beams of 15, 18 and 21 MeV were made using three dimensional water phantom and solid phantoms. Dose efficiency measurements were included in the depths of dmax for the electrons of energies specified in the solid phantom. By getting use of these measurements; stopping power of air to water, humidity factor, electrometer correction factors, correction factors of ion chamber, phantom corrections, temperature and pressure factors affecting the radiation dose were examined in different electrometer and ion chambers. The data obtained from these measurements was calculated according to the criteria of Technical Reports Series No. 277 published by IAEA.