IMPLEMENTATION OF TRS-398 PROTOCOL IN ROUTINE CALIBRATION OF LINAC BY DETERMINATION OF SLAB PHANTOM ON WATER PHANTOM CORRECTION FACTOR

The water phantom is used for LINAC calibration to measure absorbed dose radiation. Practically, it requires a long preparation time and considered less efficient. To increase efficiency, the medical physics team in hospital uses slab as tool. Consequently, correction factor crucial define equivalence of doses resulted from phantom. measurement was performed according IAEA TRS-398 dosimetry protocol with cylindrical ionization chamber detector 6 MV photon beam electron beams Elekta Synergy Platform 154029 MeV, 8 10 12 MeV energy variations. field size 30 cm x cm. Based on protocol, calculated based absolute photons beam, are 1.0018; 0.9995; 0.9979; 1.0041 1.0068, respectively. As result, radiation measured by calibrated using has an equivalent amount