Monte Carlo Method In <sup> 60 </ Sup> Co Therapy Unit Of Radiation Protection In Applied Research

Radiation therapy plays an important role in the cancer treatment. Co60 radiation therapy machine are commonly used in hospitals. Go with broad application of radiation therapy, this means we must completely and clearly understand on the foundation of radiation elementary and radiation protection in order to have more rational shield protection. Accurate analyses for the shield structure of radiation protection and the dose distribution of treatment will help insure radiation therapy quality and effectiveness. This dissertation is subject to the research of the radiation protection from the 60Co therapy machine using the MCNP4C software.It starts with the basic calculation of the radiation protection, comes to attenuation principles and experiential expressions, and applies these principles to evaluate the design of the radiation protection so as to achieve the purpose of radioactive prevention. This work is dedicated to the study of 60Co therapy machine and shield structure in the Monte Carlo method, and evaluate effectively the wall,the lead door of radiation architecture. Results indicate attenuation principles,experiential expressions and Monte Carlo method meet the request of radiation shield protection with the three calculations of contrastive; it is recommended Monte Carlo method in calculation of protection door.The purpose of this article is to build simple process and higher precision calculation of Monte Carlo photon dose method on MCNP4C. Here the Monte Carlo method is used to calculate the 60Coγray dose distribution in a water Phantom using the MCNP4C software .The sampling efficiency is improved by analytical method to confirm the direction of the incident particles. The results show calculation by the Monte Carlo method is agree very well with measurements using NE2670. It indicates that the method used in calculating 60Coγray dosed distribution in water phantom is feasible. Moreover passing through simulating a thorax phantom of patient, we utilize MCNP4C in dose calculation. In comparing the results of method and measurements with the Monte Carlo method, errors for Monte Carlo method is less than radiation therapy dose. we systematically study the feasibility of using Monte Carlo method in dose calculation. Though validating the reliability with Monte Carlo simulating radioactivity particle to treat tumors, this work can provide theoretical base in developing radiation protection. In concrete practice, we can use the results of Monte Carlo method to revise the results of radiation therapy in order to ensure the quality of radiation therapy.Through the research of the radiation protection from the 60Co therapy machine, it can guide the work of radiation protection. And it can improve the nature recognize of physics in field, provide better service for clinical application. The result may provide a support for scheme of treatment with the results of simulation.