Isfahan University of Technology,
The Physics Society of IranIranian Journal of Physics Research1682-695723120230522Calculation of photon absorbed dose kernel in a homogeneous water phantom by Monte Carlo Geant4 toolkitCalculation of photon absorbed dose kernel in a homogeneous water phantom by Monte Carlo Geant4 toolkit6572335810.47176/ijpr.23.1.81563FAKeyvanTabaeiEnergy Engineering and Physics Department, Amirkabir University of Technology, P.O.BOX: 4413-15875, Tehran, IranMojtabaShamsaei Zafarghand,Energy Engineering and Physics Department, Amirkabir University of Technology, P.O.BOX: 4413-15875, Tehran, IranJournal Article20220826Nowadays, convolution/superposition(C/S) is used to calculate absorbed dose distribution by using the absorbed dose kernel(ADK). ADK describes the absorbed dose distribution per number of interaction at a small volume around the point of photon interaction. The purpose of this study is to calculate ADK and investigate its angular and radial behavior. In this study, ADK is calculated in a homogeneous water phantom in the polar coordinates by using the Monte Carlo Geant4 toolkit for monoenergetic photons with energies in the range 0.3MeV-5MeV. To study accurately, ADK is divided into several groups in order of produced charged particle set in motion at each photon interaction. Our result shows ADK rapidly decreases as the polar angle, with respect to the incident photon direction, is increased. As the radial distance from the interaction point increases, ADK is raised and then strongly decreased. ADK is symmetrically distributed around the point of interaction for low incident photon energy while forward distributed for high incident energy photons.Nowadays, convolution/superposition(C/S) is used to calculate absorbed dose distribution by using the absorbed dose kernel(ADK). ADK describes the absorbed dose distribution per number of interaction at a small volume around the point of photon interaction. The purpose of this study is to calculate ADK and investigate its angular and radial behavior. In this study, ADK is calculated in a homogeneous water phantom in the polar coordinates by using the Monte Carlo Geant4 toolkit for monoenergetic photons with energies in the range 0.3MeV-5MeV. To study accurately, ADK is divided into several groups in order of produced charged particle set in motion at each photon interaction. Our result shows ADK rapidly decreases as the polar angle, with respect to the incident photon direction, is increased. As the radial distance from the interaction point increases, ADK is raised and then strongly decreased. ADK is symmetrically distributed around the point of interaction for low incident photon energy while forward distributed for high incident energy photons.https://ijpr.iut.ac.ir/article_3358_c78897a5adb50e31ed497c4d9d46f90f.pdf