Estimating the Dimensions of the Radiological Field Suitable For the Treatment of Cancerous Tumors by Simulating a Proton Treatment System and Applying It to a Water Phantom Using the MCNP Code

Abstract

Abstract: In this paper, the proton therapy system was simulated using the MCNPX code, and an analysis of the dimensions of the resulting radioactive field and dose distribution within the radiation field was conducted using the double beam scattering technique. The energy deposited in terms of depth was also studied within a water phantom with dimensions of 11×11×30〖 cm〗^3 divided into elemental volumes, each measuring 1x1x0.4〖 cm〗^3. This analysis was performed using a modified acceleration for range, where each cycle of the modified wheel was divided into 25 steps, with each step represented by an equivalent thickness of lead and Lexan. The study revealed the possibility of obtaining a radioactive field with dimensions of 7 x 7〖 cm〗^2 , concentrating about 95% to 100% of the maximum dose. Additionally, it was also found that the dose distribution can extend to a depth of 20 cm within the phantom. Keywords: Protons, MCNPX, Proton therapy system, Radiation dose.