title: Calculations of stopping powers and inelastic mean free paths for 20 eV-20 keV electrons in 11 types of human tissue.
abstract: Systematic calculations are performed for determining the stopping powers (SP) and inelastic mean free paths (IMFP) for 20 eV-20 keV electrons in 11 types of human tissue. The calculations are based on a dielectric model, including the Born-Ochkur exchange correction. The optical energy loss functions (OELF) are empirically evaluated, because of the lack of available experimental optical data for the 11 tissues under consideration. The evaluated OELFs are examined by the f-sum rule expected from the dielectric response theory, and by calculation of the mean excitation energy. The calculated SPs are compared with those for PMMA (polymethylmethacrylate, a tissue equivalent material) and liquid water. The SP and IMFP data presented here are the results for the 11 human tissues over the energy range of 20 eV-20 keV, and are of importance in radiotherapy planning and for studies of various radiation effects on human tissues.
authors.affiliation: School of Electrical Engineering, Shandong University, Jinan 250061, Shandong, PR China. Electronic address: tzy@sdu.edu.cn.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Tan
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
mesh_terms: D000465:Algorithms; D004583:Electrons / Q000009:adverse effects* / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008297:Male; D008954:Models, Biological; D055620:Optical Phenomena; D009928:Organ Specificity; D019047:Phantoms, Imaging / Q000706:statistics & numerical data; D019904:Polymethyl Methacrylate; D014867:Water
chemical_list: D014867:Water; D019904:Polymethyl Methacrylate
keywords: Dielectric theory; Human tissue; Inelastic mean free path; Stopping power