Therapeutic dose simulation of a 6 MV Varian Linac photon beam using GEANT4

E. Salama*, A. S. Ali, N. E. Khaled, A. Radi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A developed program in C++ language using GEANT4 libraries was used to simulate the gantry of a 6 MV high energy photon linear accelerator (Linac). The head of a clinical linear accelerator based on the manufacturer's detailed information is simulated. More than 2× 109 primary electrons are used to create the phase space file. Evaluation of the percentage depth dose (PDD) and flatness symmetry (lateral dose profiles) in water phantom were performed. Comparisons between experimental and simulated data were carried out for three field sizes; 5 × 5, 10 × 10 and 15 × 15 cm2. A relatively good agreement appeared between computed and measured PDD. Electron contamination and spatial distribution for both photons and electrons in the simulated beam are evaluated. Moreover, the obtained lateral dose profiles at 15, 50, and 100 mm depth are compatible with the measured values. The obtained results concluded that, GEANT4 code is a promising applicable Monte Carlo program in radiotherapy applications.

Original languageEnglish
Article numberT10008
JournalJournal of Instrumentation
Issue number10
Publication statusPublished - Oct 27 2015
Externally publishedYes


  • Accelerator modelling and simulations (multi-particle dynamics
  • Instrumentation for particle accelerators and storage rings - high energy (linear accelerators synchrotrons)
  • Interaction of radiation with matter
  • Radiotherapy concepts
  • single-particle dynamics)

ASJC Scopus subject areas

  • Instrumentation
  • Mathematical Physics


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