A Monte- Carlo simulation of received doses by prostate and some critical organs following prostate brachytherapy using 3 isotope seeds 131Cs, 103Pd and 125 I

Using the Monte Carlo N-Particle computer code (MCNP), doses were calculated for organs of interest such as the stomach, prostate, liver, and kidneys while patients were undergoing prostate brachytherapy. This research is important because the doses delivered to the prostate are extremely high and the organs near the prostate are potentially at risk of receiving high doses of radiation, leading to increased probabilities of adverse health effects such as cancer. In this research, MCNP version AWT IMAGEC codes were used to calculate the imparted energies to the organs of interest due to125I, 103Pdand 131Cs treatment sources. The nearest organs to the prostate received highest energy depositions and the organs farthest from the prostate received the lowest energy depositions. Once the dose per transformation for each organ of interest is determined, then using the total transformation due to given activities of the sources over an infinite time would result in the total deposition of energy per kilogram of the related organ. All received doses in prostate were found to be 80, 96 and 102 Gy for 131Cs ¡ 103Pd and125I respectively. The stomach received the highest dose (2 Gy) and the lowest absorption obtained in lung (0.27 × 10-4Gy).