Research Methods: Using the standard test dose of genuine IBA accelerators include: 3D water phantom system, CC13 ionization chamber, ionization chamber FC65, gauges combined with software CCU measured doses OmniPro-Accept sweep , experimental measurements conducted with two photon beams with energies of 6MV and 15MV linear accelerator Oncology Hospital in Hanoi and evaluate the quality of photon beams.
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