Research On Energetic Charged Particles’ Detection And The Radiation Effects In Human Tissues Based On Monte Carlo Method

With the development of China’s space industry, the manned spacecraft has been gradually separated from the earth orbit into deep space. The research data show that the space energetic charged particles are one of the main causes of the failure of the space instrument and the radiation hazard of the astronauts. In order to better explore the composition and characteristics of space radiation environment, and further study the reinforcement of spaceflight apparatus of radiation, radiation damage and the radiation biological effects on astronauts, the Monte Carlo simulation research about energetic charged particles detection and human tissue material radiation effect is becoming increasingly important.Based on a certain type of anti-coincidence △E-E particle telescope system, which was created by the Suzhou University radiation technology team, the Monte Carlo package GEANT4 was used to simulate the energy detector response of the semiconductor and crystal detector, and calculate the energy losses, range track, and LET(linear energy transfer) value indifferent part of the telescope system. The results of different types of high-energy particle detector energy deposition were analyzed and compared in this paper. The results showed that the △E-E telescope system consisting of a fixed thickness of semiconductor and crystal detector not only has good energy response to protons with the energy range of 8-175 MeV, but also has a certain function of particle identification. Increasing the thickness of the crystal detector can improve the energy measurement range of the detector, and increasing the width of the crystal detector can improve the angle measurement range.In addition, the energy transmission characteristics of heavy ions in different human tissue materials(brain tissue, bone, skin), provided by the GEANT4 human tissue material library classes, was studied in this paper. The dose distribution of medical heavy ions in different human tissues were analyzed and compared. At the same time, this paper used theGEANT4 toolkit to construct a tumor modified Snyder human head phantom, and simulated the heavy ion therapy process for the treatment of intracranial tumor. The simulation results proved the superiority of proton and heavy ion radiotherapy in intracranial tumor treatment and provided comparative data about treatment plan design and Monte Carlo simulation of proton and heavy ion radiotherapy, which has a positive and practical significance on the clinical application of proton and heavy ion cancer therapy.