A comparative study on Monte Carlo simulations of electron emission from liquid water

被引：23

作者：

Mehnaz ^{[1
,2
]}

Yang, L. H. ^{[1
,2
]}

Zou, Y. B. ^{[3
]}

Da, B. ^{[4
]}

Mao, S. F. ^{[5
]}

Li, H. M. ^{[6
]}

Zhao, Y. F. ^{[7
]}

Ding, Z. J. ^{[1
,2
]}

机构：

[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[2] Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China

[3] Xinjiang Normal Univ, Sch Phys & Elect Engn, Urumqi 830054, Xinjiang, Peoples R China

[4] Natl Inst Mat Sci, Res & Serv Div Mat Data & Integrated Syst MaDIS, Ctr Mat Res Informat Integrat CMI2, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

[5] Univ Sci & Technol China, Dept Engn & Appl Phys, Hefei 230026, Anhui, Peoples R China

[6] Univ Sci & Technol China, Supercomp Ctr, Hefei 230026, Anhui, Peoples R China

[7] Univ Sci & Technol China, Anhui Prov Hosp, Dept Radiotherapy, Hefei 230026, Anhui, Peoples R China

来源：

MEDICAL PHYSICS | 2020年 / 47卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Geant4-DNA; Monte Carlo; secondary electron; water; LOW-ENERGY ELECTRONS; DIELECTRIC RESPONSE MODEL; INELASTIC CROSS-SECTIONS; CONDUCTION-BAND EDGE; MEAN-FREE-PATH; SECONDARY-ELECTRON; BETHE SURFACE; SCATTERING; TRANSPORT; SPECTROSCOPY;

D O I：

10.1002/mp.13913

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

Purpose Liquid water being the major constituent of the human body, is of fundamental importance in radiobiological research. Hence, the knowledge of electron-water interaction physics and particularly the secondary electron yield is essential. However, to date, only very little is known experimentally on the low energy electron interaction with liquid water because of certain practical limitations. The purpose of this study was to gain some useful information about electron emission from water using a Monte Carlo (MC) simulation technique that can numerically model electron transport trajectories in water. Methods In this study, we have performed MC simulations of electron emission from liquid water in the primary energy range of 50 eV-30 keV by using two different codes, i.e., a classical trajectory MC (CMC) code developed in our laboratory and the Geant4-DNA (G4DNA) code. The calculated secondary electron yield and electron backscattering coefficient are compared with experimental results wherever applicable to verify the validity of physical models for the electron-water interaction. Results The secondary electron yield vs. primary energy curves calculated using the two codes present the same generic curve shape as that of metals but in rather different absolute values. G4DNA underestimates the secondary electron yield due to the application of one step thermalization model by setting a cutoff energy at 10 eV so that the low energy losses due to phonon excitations are omitted. Our CMC code, using a full energy loss spectrum to model electron inelastic scattering, allows the simulation of individual phonon scattering events for very low energy losses down to 10 meV, which then enables the calculated secondary electron yields much closer to the experimental data and also gives quite reasonable energy distribution curve of secondary electrons. Conclusions It is concluded that full dielectric function data at low energy loss values below 10 eV are recommended for modeling of low energy electrons in liquid water.

引用

页码：759 / 771

页数：13

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