Analysis of 70 - 300 MeV Proton Energy on Homogeneous and Inhomogeneous Phantoms
Ari Fitria (a), Tony Sumaryada(a), Sitti Yani (a*)

Department of Physics, Faculty of Mathematics and Natural Sciences, IPB University

Abstract

Proton therapy represents an advanced form of radiotherapy employing proton particles to precisely target a designated area while minimizing harm to neighboring tissue. As these proton particles traverse the body, they come to rest at a specific depth, generating what^s known as a Bragg peak. The primary objective of this research is to assess the percentage depth dose (PDD) resulting from proton radiation in both homogeneous and inhomogeneous phantoms. The homogeneous phantom replicates the composition of water, bone, and lungs, while the inhomogeneous phantom comprises a mixture of these materials. To emulate the interaction between the phantom and proton radiation, the study employed the Monte Carlo-based PHITS software. The findings underscore the substantial impact of material density and proton energy on the depth of the Bragg peak. Notably, at an energy level of 70 MeV, the Bragg peak manifested at 3.80 cm for the water phantom, 2.60 cm for the bone phantom, and 15.8 cm for the lung phantom. Furthermore, elevating the proton energy led to a proportionally deeper Bragg peak placement.

Keywords: Monte Carlo, PHITS, Proton Therapy

Topic: Biophysics and Medical Physics