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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:57 |
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Conference: Bucharest University Faculty of Physics 2016 Meeting
Section: Biophysics; Medical Physics
Title:
Dosimetry and Radioprotection Elements.The Assurance of the Calibration Traceability of Dosimetric Equipment Used in Radiotherapy
Authors:
Mirabela DUMITRACHE (1,2), Mihaela DUMITRACHE (1,2), Daniela STROE (2), Claudia Gabriela CHILOM (1), Ion CALINA (1,3), Elena STANCU (3), Eugenia BADITA (3), Cătălin VANCEA (3)
Affiliation:
1) University of Bucharest, Faculty of Physics, Bucharest, Romania
2) Clinical Hospital "COLTEA", Department of Radiation Oncology, Bucharest, Romania
3) National Institute for Laser, Plasma and Radiation Physics - INFLPR, Bucharest, Romania
E-mail
dumitrache.mira@gmail.com
Keywords:
Radiation therapy, absorbed dose of water, medical linear accelerator, calibration traceability, En numbers
Abstract:
This study presents the assurance of the traceability of dosimetric equipment used in radiotherapy. The traceability is the report of calibration factors of ionization chambers used in photon and electron beam detection. The results obtained correspond to the calibration factors for cylindrical and parallel ionization chambers in radiation beams used by Primus Mevatron medical linear accelerator. This accelerator belongs to the Department of Radiation Oncology,Clinical Hospital "Coltea", Bucharest, Romania. The method of calibration is according to IAEA TRS-398 reference Code of Practice. The calibrations were conducted using water proof ionization chambers in a water equivalent phantom at the reference point at 5 g cm-2 for a 10 cm x 10 cm field size and at SSD/SCD = 100 cm (SSD - the distance between the source and the phantom surface; SCD = the distance between the source and the ionization chamber). For the electron beam, the measurement were conducted using 7 MeV at the reference point of 1.3 g cm2 for a 10 cm x 10 cm field size at SSD 100 cm. The ionization chambers, used as reference in the calibration process, are calibrated at the primary standard PTB - Braunschweigh (German Federal Institute of Physics and Metrology), assuring the secondary standard level. For each measured value, the uncertainty was taken into consideration and then evaluated. En numbers was evaluated according to ISO 13528:2005. The found values were in the limits of statistical performance, En = [-1; 1], concluding that the laboratory performance is quite satisfactory.
Acknowledgement:
This work was supported by The Department of Radiation Oncology from Clinical Hospital "Coltea", Bucharest, Romania, and Secondary Standard Dosimetry Laboratory at High Energies-STARDOOR of the National Institute for Laser, Plasma and Radiation Physics - INFLPR, Bucharest, Romania.
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