Comparing the Measurement Value of Photon Contamination Absorbed Dose in Electron Beam Field for Varian Clinical Accelerator

The IUP Journal of Physics, Vol. IV, No. 3, July 2011, pp. 7-11

Posted: 15 May 2012

See all articles by M. Mahdavi

M. Mahdavi

Mazandaran University - Department of Physics

S.R.M. Mahdavi

Iran University of Medical Sciences

H. Alijanzadeh

Mazandaran University - Department of Physics

M. Zabihzadeh

Tehran University of Medical Sciences

Date Written: May 15, 2012

Abstract

Sometimes in electron radiotherapy, Bremsstrahlung photon is produced in accelerator head. This photon contamination creates various doses in electron beams. In this study, varian accelerator in electron mode has been simulated and the photon contamination depth dose for three energies 6, 9 and 12 MeV in Monte Carlo method was calculated. Also, electron depth dose curves in simulation and measurement were compared. The discrepancies between measurement and simulation of depth dose curves were calculated in high accuracy by a program that was written in FORTRAN language. The error average is less than 1.5% in semilinear region for these three energies. Results show that the simulation has a good accuracy. Also, the graphs demonstrate that the dose of photon contamination is trivial versus electron dose. In phantom surface percentage photon contamination dose for these three energies ranged between 0.284% and 0.340% of maximum dose.

Keywords: clinical dosimetry, Monte Carlo simulation, photon contamination, Bremsstrahlung effect

Suggested Citation

Mahdavi, M. and Mahdavi, S.R.M. and Alijanzadeh, H. and Zabihzadeh, M., Comparing the Measurement Value of Photon Contamination Absorbed Dose in Electron Beam Field for Varian Clinical Accelerator (May 15, 2012). The IUP Journal of Physics, Vol. IV, No. 3, July 2011, pp. 7-11, Available at SSRN: https://ssrn.com/abstract=2060117

M. Mahdavi (Contact Author)

Mazandaran University - Department of Physics ( email )

Babolsar
Iran

S.R.M. Mahdavi

Iran University of Medical Sciences ( email )

Hemmat Hwy
Tehran
Iran

H. Alijanzadeh

Mazandaran University - Department of Physics ( email )

Babolsar
Iran

M. Zabihzadeh

Tehran University of Medical Sciences ( email )

Number 21, Dameshg St.
Vali-e Asr Ave.
Tehran, 14195
Iran

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