Abstract：In this paper a model of simulating the track structure of low-energy electrons in liquid water is presented. The electron inelastic cross-sections are obtained based on the dielectric response theory, in which the optical-data model newly developed by Emfietzoglou et al. is implemented and the low-energy Born-correction scheme composed of the Ochkur approximation and the classical Coulomb-field approach is used. In addition, a novel mean elastic cross-section based on the Mott model is adopted for electron elastic scattering in liquid water for high simulation efficiency. Using the present model, the calculation of the spatial distributions of both inelastic scattering events and energy depositions in liquid water is carried out, and the penetration parameters of low-energy electrons in liquid water are evaluated. These results are compared with other theoretical calculations, indicating that using the present model the track structure of low-energy electrons in liquid water can be exactly simulated.
谭震宇, 张黎明, 王晶, 高洪霞. 电磁辐射生物效应研究中的一个基本问题 ——低能电子在水中的径迹结构[J]. 电工技术学报, 2012, 27(12): 1-6.
Tan Zhenyu, Zhang Liming, Wang Jing, Gao Hongxia. A Basic Project for the Study on the Effect on the Electromagnetic Radiation Biology——Track Structure of Low-Energy Electrons in Liquid Water. Transactions of China Electrotechnical Society, 2012, 27(12): 1-6.
[1] Nikjoo H, Uehara S, Emfietzoglou D, et al. Track-structure codes in radiation research[J]. Radiation Measurement, 2006, 41(9-10): 1052-1074. [2] 马云志, 曹天光, 卓益忠. 低能电子在生物介质中的输运过程[J]. 山西师范大学学报(自然科学版), 2002, 16(2): 36-43. Ma Yunzhi, Cao Tianguang, Zhou Yizhong. The transport process of low energy electrons in biological media[J]. Journal of Shanxi Teacher’s University (Natural Science Edition), 2002, 16(2): 36-43. [3] 马云志, 曹天光, 卓益忠. 低能电子在水介质中的输运过程[J]. 高能物理与核物理, 2003, 27(4): 319-323. Ma Yunzhi, Cao Tianguang, Zhou Yizhong. Low energy electron transportation process in water media[J]. High Energy Physics and Nuclear Physic, 2003, 27(4): 319-323. [4] Uehara S, Nikjoo H, Goodhead D T. Cross sections for water vapour for the Monte Carlo electron track structure code from 10 eV to the MeV region[J]. Physics in Medicine and Biology, 1992, 38(12): 1841-1858. [5] Emfietzoglou D, Nikjoo H A. Accurate electron inelastic cross sections and stopping powers for liquid water over the 0. 1-10keV range based on an improved dielectric description of the bethe surface[J]. Radiation Research, 2007, 167(1): 110-120. [6] 谭震宇, 张黎明, 高洪霞. 低能电子在水中的弹性散射[J]. 计算物理, 2010, 27(6): 811-815. Tan Zhenyu, Zhang Liming, Gao Hongxia. Elastic scattering of low-energy electrons in liquid water[J]. Chinese Journal of Computational Physics, 2010, 27(6): 811-815. [7] Nikjoo H, O’Neill P, Goodhead D T, et al. Computational modeling of low-energy electron induced DNA damage by early physical and chemical events[J]. International Journal of Radiation Biology, 1997, 71(5): 467-483. [8] Emfietzoglou D, Papamichael G, Androulidakis I, et al. A Monte Carlo study of sub-keV electron transport in water: the influence of the condensed phase[J]. Nuclear Instruments and Methods in Physics Research Section B, 2005, 228(1-4): 341-348. [9] Cobut V, Frongillo Y, Patau J P, et al. Monte Carlo simulation of fast electron and proton track structure in liquid water-I. physical and physicochemical aspects[J]. Radiation Physics and Chemistry, 1998, 51(3): 229-243. [10] Wilson W E, Miller J H, Lynch D J, et al. Analysis of low-energy electron track structure in liquid water[J]. Radiation Research, 2004, 161(5): 591-596. [11] Walker D W. Relativistic effects in low energy electron scattering from atoms[J]. Advances in Physics, 1971, 20(85): 257-323. [12] Jablonski A, Salvat F, Powell C J. NIST electron elastic-scattering cross-section database-version 3.1[M], National Institute of Standards and Technology, Gaithersburg, MD 2003. [13] Danjo A, Nishimura H. Elastic scattering of electrons from H2O molecule[J]. Journal of the Physical Society of Japan, 1985, 54(4): 1224-1227. [14] Katase A, Ishibashi K, Matsumoto Y, et al. Elastic scattering of electrons by water molecules over the range 100-1000 eV[J]. Journal of Physics B: Atomic and Molecular Physics, 1986, 19(17): 2715-2734. [15] Muñoz A, Oller J C, Blanco F, et al. Electron scattering cross sections and stopping powers in H2O[J]. Physical Review A, 2007, 76(5): 052707-1. [16] Fernandez-Varea J M, Mayol R, Liljequist D, et al. Inelastic scattering of electrons in solids from a generalized oscillator strength model using optical and photoelectric data[J]. Journal of Physics: Condes. Matter, 1993, 5(22): 3593-3610. [17] Vriens L. Binary-encounter electron-atom collision theory[J]. Physical Review, 1966, 141(1): 88-92. [18] Dingfelder M, Hantke D, Inokuti M, et al. Electron inelastic-scattering cross sections in liquid water[J]. Radiation Physics and Chemistry, 1999, 53(1): 1-18. [19] 谭震宇, 宋传杰, 裘培勇. 固体中散射电子空间输运的矩阵方程[J]. 山东工业大学学报, 1992, 22(4): 30-35. Tan Zhenyu, Song Chuanjie, Qiu Peiyong. Matrix equation of spatial travel of scattering electron in solid[J]. Journal of Shandong Polytechnic University, 1992, 22(4): 30-35. [20] Emfietzoglou D, Karava K, Papamichael G, et al. Monte Carlo simulation of the energy loss of low-energy electrons in liquid water[J]. Physics in Medicine and Biology, 2003, 37(12): 2355-2371. [21] Emfietzoglou D, Papamichael G, Androulidakis I, et al. A Monte-carlo study of sub-keV electron transport in water: the influence of the condensed phase[J]. Nuclear Instruments and Methods in Physics Research Section B, 2005, 228(1-4): 341-384. [22] Meesungnoen J, Jay Gerin J P, Filali Mouhim A, et al. Low energy electron penetration range in liquid water[J]. Radiation Research, 2002, 158(5): 657-660. [23] Akkerman A, Akkerman E. Characteristics of electron inelastic interactions in organic compounds and water over the energy range 20-10 000 eV[J]. Journal of Applied Physics, 1999, 86(10): 5809-5816. [24] Pimblott S M, Siebbeles L D A. Energy loss by non-relativistic electrons and positrons in liquid water[J]. Nuclear Instruments and Methods in Physics Research Section B, 2002, 194(3): 237-250. [25] Liming Zhang, Zhenyu Tan. A new calculation on spectrum of direct DNA damage induced by low-energy electrons[J]. Radiation and Environmental Biophysics, 2010, 49(1): 15-26.
2012, Vol. 27 
