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UNIVERSITY OF BUCHAREST FACULTY OF PHYSICS Guest 2024-11-23 18:12 |
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Conference: Bucharest University Faculty of Physics 2016 Meeting
Section: Atomic and Molecular Physics. Astrophysics. Applied Nuclear Physics
Title: INFLUENCE OF THE ASSESSMENT METHOD OF RADIATION BEAM QUALITY ON DELIVERED ABSORBED DOSE TO WATER QUANTITY
Authors: E. BADITA1, C.VANCEA1,3, I. CALINA1,3, D. STROE2, M. DUMITRACHE2,3, E. STANCU1,3, F. SCARLAT1, M. DUMITRACHE3
Affiliation: 1 National Institute for Laser, Plasma and Radiation Physics, 409 Atomistrilor str., Magurele, Ilfov
2 Clinical Hospital "Coltea", Radiotherapy Department, Bucharest, Romania
3Bucharest of University, Physics Faculty, 407 Atomistilor str, Magurele, Ilfov
E-mail elena.stancu@inflpr.ro, eugenia_badita@yahoo.com
Keywords: radiation beam quality factor, high energy photons, radiation therapy, tissue phantom ratio, clinical dosimetry
Abstract: The beam quality Q of high energy photons beam produced by clinical linear accelerator was assessed using two standard method IAEA TRS 398 Code of Practice and AAPM TG-51 Report. The beam quality is specified by the tissue phantom ratio TPR20,10 according IAEA TRS 398 Code of Practice. The tissue phantom ratio TPR20,10 is the beam quality Q of high energy photons produced by clinical accelerators. For determining its is measured absorbed dose at 10 cm and 20 cm in water phantom with a constant SSD of 100 cm and a field size of 10 cm x 10 cm at the plane of the chamber. According to AAPM TG 51 report the beam quality specified %dd(10)x is the percentage depth dose at 10 cm in a water phantom due to photons only. %dd(10)x is defined at SSD = 100 cm for a field size of 10 cm x 10 cm at the phantom surface. In high energy photon beams are recommended only cylindrical ionization chambers. This paper presents the measurements of beam quality Q of photons beam using different standard procedures. The experiments were performed at the linear accelerator owned by the clinical dosimetry laboratory in the radiotherapy department of the “Coltea” Hospital. The measurements were performed for 6 MV high energy photon beam. The confrontation measurement method for higher energies are in progress.
Acknowledgement: Acknowledgement Clinical Hospital "Coltea", Radiotherapy Department, Bucharest, Romania fot the experiments.
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