The Simulation Of Extreme Ultraviolet And Induced Low-Energy Electron Track Structure In Liquid Water

The biological effect caused by extreme ultraviolet radiation is an essential research field. The radiation can cause several consequences to biological tissue, such as breaks of DNA, gene mutation, canceration or death of the cells or organs. As a consequence, it is important to study the extreme ultraviolet radiation track structure in biological tissue. In this paper, we use liquid water as the equivalent material instead of biological tissue.The initial energy range of extreme ultraviolet is about lOeV to100eV. The photon in liquid water may cause several physical reaction, such as Photoelectric Effect, Compton Scattering, Pair Production and Triplet Production. But in the extreme ultraviolet energy range, while Photoelectric Effect dominates the physical reaction, the other three should be ignored. In the higher photon energy range, Compton Scattering, Pair Production and Triplet Production can not be ignored. This paper focus on Photoelectric Effect and Compton Scattering, as well as theirs’cross sections. The paper discussed the conception of the photoelectric cross sections and Compton scattering cross sections, also the theoretical calculations of them. In this work, we use the EPDL97(the Evaluated Photon Data Library1997version by Lawrence Livermore National Laboratory, USA) photoelectric cross section data. The EPDL97is recommended by scientists over the world.The photoelectron caused by photoelectric effect in the liquid water, can also cause the physical reaction of liquid water. In this work, we discussed elastic scattering, inelastic scattering and hot treatment. However, the inelastic scattering divided into five ionizations, five excitations, water molecules’ Vibrational Excitation and Rotational Transitions. In the last, when the electron energy is lower than0.005eV, the track will end here, the energy will lose in one pace, also named this process as hot treatment.Based on Monte Carlo random sampling method, the simulation of extreme ultraviolet and induced electron radiation in liquid water track structure can be programmed in computer. This paper considered photoelectric effect, elastic scattering. five ionizations’ modes, five excitations’modes, water molecules’ vibrational excitation and rotational transitions, hot treatment. Using the coordinate point data, we can get the track structure. In the end, based on the coordinate point data and energy lose data, using the u-Random Sampling Method, the Absolute Frequency Distributions of Energy Deposition in DNA model can be got.