Designing CT scanning rooms and estimating patient and personnel absorbed dose using code (MCNPX 2.6)

One of the most widely used diagnostic devices in medical imaging is computed tomography scanning with the use of X-ray ionization. After years of using this tool in the diagnosis and treatment, external doses of these beams can pose a risk of secondary cancer, which is significant in terms of radiation safety and protection. In this paper, using the Monte Carlo code MCNPX2.6 performed over three phases, a 40-years-old male MIRD and CT room was designed and simulated at different locations of the CT room and the absorbed dose rate was calculated. In the first phase, by calculating and simulating, the mean absorption dose rate was obtained and then the safe and unsafe locations were identified. In the second step, by analyzing the results, the highest mean dose rate of the phantom absorption dose was obtained in the simulation of abdominal area scans and its internal organs. In the third stage of this article, by designing a lead shield, a solution was proposed to reduce the effectiveness of absorptive doses that could improve the safety level.