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İletişim adresi: Dr. Serdar Savaş Gül. Gaziosmanpaşa Üniversitesi Tıp Fakültesi Nükleer Tıp Anabilim Dalı, 60100 Tokat, Türkiye. Tel: 0356 215 00 45 e-posta: gopnukleertip@gmail.com ABSTRACT Objectives: In this study monitor ionization chamber which is contained in Siemens brand, Oncor Impression Plus model M5395 linear accelerator’s head structure which is available was examined in repeatability, linearity and authority of stopping treatment on given monitor unit. Patients and methods: Calculation of limit value evaluation which is international standard of these tests was done according to received measurement with using two teleportation methods for end effect. British Journal of Radiology and International Atomic Energy Agency’s references were used in this study. Constancy of radiation and productivity of short and long-term stability were calculated theoretically. Results: The first linearity is within ±3% for 6 MeV and 18 MeV X-ray beam and 50 MU/min and 300 MU/min the dose rates. The second linearity is within ±1% for 18 MeV 6 MeV electron beam and the energy level and concentricity measurements taken from the health field from 10x10 up to 40x40 areas. The beam linearity’s value was found <1 MU value by two irradiation methods. Conclusion: As a result of this study, it is established that the received data are relevant for international standards. The linear accelerator devices to daily, monthly and annual quality control tests will be done regularly considered effective in preventing radiation accident.

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Determining the annual quality control testing and conformity for monitor ionization chamber which is contained in linear accelerator radiotherapy treatment device’s head structure