Modeling and simulation of TEPC based on GEANT4

The evaluation of human radiation dose and the biological effect caused by radiation are one of the important tasks of nuclear medicine and radiation protection. Tissue Equivalent Proportional Counter can be used to measure the distribution of energy deposition in micro-space, and it is an important experimental method to study the interaction process of micron-scale charged particles and matter. By using the micro-dose spectroscopy, we can study the relationship between radiative deposition energy distribution and radiation biological effect, thus establish the radiation biological effect of different particles, and provide technical parameters for macroscopic dosimetry. Based on Geant4 software, a physical process simulation ability of Tissue Equivalent Proportional Counter(TEPC) is established to realize the physical modeling of the detector structure; The gamma ray and neutron nuclear reaction database, particle interface function, physical process tracking interface function, output interface function of the software is used to simulating the particles in the detector energy deposition process. Simulation experimental results show that theoretical calculation model based on GEANT4 for the Micro-dosimetry simulation study of TEPC is reliable. This is basically consistent with the principle of DNA scaling, the direction of development is to realize the simulation of DNA scale action process, to provide experimental verification method for the theoretical modeling of the interaction between Ray and matter in DNA scale, and to provide an experimental means for understanding the radiation hazard of the human body in depth.