TURKISH JOURNAL OF ONCOLOGY 2002 , Vol 17 , Num 2
DETERMINATION OF DOSIMETRIC PARAMETERS OF ORION (4 MV) PENUMBRA MODE
FÜSUN ŞENTÜRK, HATİCE BİLGE, AYDIN ÇAKIR, SEYFETTİN KUTER
Avrasya Hospital Aktif Çare Onkoloji Merkezi In this study, dosimetric parameters of ORION penumbra mode were determined and compared with standard mode data. Cirus Co-60 and ORION penumbra mode profile curves were measured in different field sizes and depths to compare penumbra width by film dosimetry. Energy and relative dose factors were measured using RW 3 solid water phantom, Farmer electrometer and 0.6 cc ion chamber. The difference was less than 1 % for Quality Index and 2% for relative dose factors. The results showed that standard dosimetric data for ORION could be used for penumbra mode irradiations. The penumbra width of ORION penumbra mode and Cirus Co-60 were similar. Keywords : perumbra, linear accelerator, dose