Monte Carlo Simulation of electron production in target material Linac 6, 10, and 18 MV photon beam
Sitti Yani(a), Indra Budiansah(b), Mohamad Fahdillah Rhani(c), and Freddy Haryanto(d)

(a) Department of Physics, Faculty of Mathematics and Natural Sciences, Bogor Agricultural University, Indonesia
(b) SMA Darul Hikam Bandung, Indonesia
(c) Department of Radiology, Kathleen Kilgour Center, New Zealand
(d) (a) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia

Abstract

Target is one of important component in a linear accelerator (Linac). Target materials depend on the energy of Linac so that they have different spectrum produced. In this study, the spectrum characteristic of target material for some Linacs using Monte Carlo codes is investigated. The target material simulated was collected from Varian Medical System. The simulation was carried out on two different Monte Carlo codes namely PHITS and EGSnrc. In the simulation process, the cut-off energy of electron and photon are set in the same value at 0.521 MeV and 0.01 MeV, respectively. The SLAB geometry is implemented to model the target. The spectrum of photon and electron was collected 0.1 cm from the end of target. The deviation of electron and photon spectrum collected from PHITS and EGSnrc was calculated in the end of simulation. The results show that the spectrum of photon and electron from PHITS and EGSnrc have the same trend with deviation less than 5%. The spectrum calculation in PHITS was more efficient than EGSnrc.

Keywords: Monte Carlo, EGSnrc, PHITS, Linac

Topic: Biophysics and Medical Physics