ANALISIS KUALITAS BERKAS RADIASI FOTON 10 MV PADA PESAWAT TELETERAPI LINEAR ACCELERATOR

Abstract

A quality control of the analysis on quality of radiation beam teletherapy linear accelerator (linac) 10 MV at Radiotherapy installation on RSPAD Gatot Subroto Jakarta, It had been done research. Beam quality judged by the quality of radiation beam energy and the homogeneity of dose distribution that includes radiation beam flatness and symmetry. The quality of radiation beam energy on main beam is measured by PDD measuring with 10 x 10 cm field size, SSD 100 cm and also with a depth of 10 cm detector. While for radiation profile measurements performed with the two directions of inplane and crossplane radiation. Profile measurement was performed with a large measure of dose rate on the main beam axis by using a detector at a depth of 10 cm, SSD 100 cm and the field size 10 x 10 cm, further measurements are made with moved the detector both right and left (inplane) and above upper and under (crossplane) on the main beam. The value of uniformity in the quality of radiation beam dose distribution can be obtained by looking at the parameters of flatness and symmetry in the radiation area. The resulth of measurement of the quality radiation beam energy is within tolerance recommended by the American Association of Physicists in Medicine (AAPM) equal to ± 2%. The homogeneity of dose distribution that includes measurement of flatness and symmetry of the obtained value is less than those of tolerance recommended by the American Association of Physicists in Medicine (AAPM) of ± 3% for beam flatness and symmetry of ± 2% for photon beam.