The comparison of photon dosimetries with different ion chambers in linear accelerator used in radio theraphy

In this study Saturne-43 Linear Accelerator treatment machine?s 6, 15 and 25 MV photon beams, and different ion chambers at Dr. Abdurrahman Yurtarslan Ankara Oncology Education and Research Hospital were used. Measurements were made using liquid and solid phantoms. Dose efficiency measurement was made in 5 cm depth for 6 MV energy photons and in 10 cm depth for 15 MV and 25 MV energy photons. In middle size water phantom measurements were made in the same depths. Benefiting from these measurements TPR20 10, M+, M-, Q1, Q2 and dose efficiency values were obtained for different ion chambers. With the data obtained from these measurements, calculations were made according to IAEA Technical Report Series No.277. Dosimetries calculated for different energy and ion chambers were compared.