Calculation of photon absorbed dose kernel in a homogeneous water phantom by Monte Carlo Geant4 toolkit

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Tabaei Keyvan; SHAMSAIE ZAFARGHANDI MOJTABA

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ISSN: 2588-4824

Journal Paper

Paper Information

Journal: Iranian Journal of Physics Research Year:2023 | Volume:23 | Issue:1( پیاپی 91) Page(s): 65-72

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Title

Calculation of photon absorbed dose kernel in a homogeneous water phantom by Monte Carlo Geant4 toolkit

Author(s)

Tabaei Keyvan | SHAMSAIE ZAFARGHANDI MOJTABA | Issue Writer Certificate

Keywords

absorbed dose kernelQ4

dose distribution calculationQ4

convolutionQ4

Geant4 toolkitQ4

Abstract

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.

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