The Development Of The Monte Carlo Program For The Gamma Photon Transport In The Material

The second stage of the Chinese moon-landing project will achieve soft landing and scientific research. The landing detector is responsible for carrying the rover and payload. Because the condition of the detector on the moon is very complex and it is difficult to simulate the environment conditions such as vacuum, moon dust and plume on the earth, it is higher risk and time-consuming for the work. So it is necessary to compare the simulation and the test, and obtain the indexes of the calibration, the dependence of the counting rate on the altitude. Using the MCNP program, the seniors in our lab developed a reliable simulation method, to perform the simulation for different test conditions. As a natural continuation of previous work, based on the OOT (object oriented technology) of C++, this work developed a program which can describe gamma photon transporting in the material by Monte Carlo method. We compare it with Geant4 and MCNP, and find that the result is consistent, this work includes the following work:1. The simulation of the simple element is developed, and the application development solutions for simple elemental are confirmed to be reliable.2. The simulation of compounds and complex mixture is developed, confirms that program development scheme for simple compounds and complex compounds are reliable.3. Establishing a simple model and developing the simulation of the model, and comparing it with MCNP, confirms that program development plan for a simple model is reliable.4. According to the kernel program development software interface, realize the visualization of program development software.In this work, through a series of extremely detailed simulation, from elements, compounds to cement targets, for photons incidence, we compared results with Geant4 operation results, and confirmed that the program development plan for a simple calculation based on the theory of target surface is feasible. Compared the simulation of simple model with MCNP, it confirms that our program development plan for a simple model of the simulation calculation in both the theoretical basis and engineering technology is feasible. Finally, we give the simple model developed software interface, make it a simple prototype. The work provides a good basis and theoretical guidance for the subsequent simplification and self-development of software.