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Title: Computer Simulation of Electron Thermalization in CsI and CsI(Tl)

Abstract

A Monte Carlo (MC) model was developed and implemented to simulate the thermalization of electrons in inorganic scintillator materials. The model incorporates electron scattering with both longitudinal optical and acoustic phonons. In this paper, the MC model was applied to simulate electron thermalization in CsI, both pure and doped with a range of thallium concentrations. The inclusion of internal electric fields was shown to increase the fraction of recombined electron-hole pairs and to broaden the thermalization distance and thermalization time distributions. The MC simulations indicate that electron thermalization, following {gamma}-ray excitation, takes place within approximately 10 ps in CsI and that electrons can travel distances up to several hundreds of nanometers. Electron thermalization was studied for a range of incident {gamma}-ray energies using electron-hole pair spatial distributions generated by the MC code NWEGRIM (NorthWest Electron and Gamma Ray Interaction in Matter). These simulations revealed that the partition of thermalized electrons between different species (e.g., recombined with self-trapped holes or trapped at thallium sites) vary with the incident energy. Implications for the phenomenon of nonlinearity in scintillator light yield are discussed.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1029077
Report Number(s):
PNNL-SA-81306
Journal ID: ISSN 0021-8979; JAPIAU; NN2001000; TRN: US1105542
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 110; Journal Issue: 6; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACOUSTICS; COMPUTERIZED SIMULATION; ELECTRIC FIELDS; ELECTRONS; EXCITATION; PHONONS; PHOSPHORS; SCATTERING; SPATIAL DISTRIBUTION; THALLIUM; THERMALIZATION; SCINTILLATOR NON-PROPORTIONALITY; LIQUID-NITROGEN TEMPERATURES; MONTE-CARLO-SIMULATION; GAMMA-RAY INTERACTION; LIGHT YIELD; ENERGY RESOLUTION; INORGANIC SCINTILLATORS; THALLIUM CONCENTRATION; ALKALI-HALIDES; PURE CSI

Citation Formats

Wang, Zhiguo, Xie, YuLong, Cannon, Bret D., Campbell, Luke W., Gao, Fei, and Kerisit, Sebastien N. Computer Simulation of Electron Thermalization in CsI and CsI(Tl). United States: N. p., 2011. Web. doi:10.1063/1.3632969.
Wang, Zhiguo, Xie, YuLong, Cannon, Bret D., Campbell, Luke W., Gao, Fei, & Kerisit, Sebastien N. Computer Simulation of Electron Thermalization in CsI and CsI(Tl). United States. doi:10.1063/1.3632969.
Wang, Zhiguo, Xie, YuLong, Cannon, Bret D., Campbell, Luke W., Gao, Fei, and Kerisit, Sebastien N. Thu . "Computer Simulation of Electron Thermalization in CsI and CsI(Tl)". United States. doi:10.1063/1.3632969.
@article{osti_1029077,
title = {Computer Simulation of Electron Thermalization in CsI and CsI(Tl)},
author = {Wang, Zhiguo and Xie, YuLong and Cannon, Bret D. and Campbell, Luke W. and Gao, Fei and Kerisit, Sebastien N.},
abstractNote = {A Monte Carlo (MC) model was developed and implemented to simulate the thermalization of electrons in inorganic scintillator materials. The model incorporates electron scattering with both longitudinal optical and acoustic phonons. In this paper, the MC model was applied to simulate electron thermalization in CsI, both pure and doped with a range of thallium concentrations. The inclusion of internal electric fields was shown to increase the fraction of recombined electron-hole pairs and to broaden the thermalization distance and thermalization time distributions. The MC simulations indicate that electron thermalization, following {gamma}-ray excitation, takes place within approximately 10 ps in CsI and that electrons can travel distances up to several hundreds of nanometers. Electron thermalization was studied for a range of incident {gamma}-ray energies using electron-hole pair spatial distributions generated by the MC code NWEGRIM (NorthWest Electron and Gamma Ray Interaction in Matter). These simulations revealed that the partition of thermalized electrons between different species (e.g., recombined with self-trapped holes or trapped at thallium sites) vary with the incident energy. Implications for the phenomenon of nonlinearity in scintillator light yield are discussed.},
doi = {10.1063/1.3632969},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 6,
volume = 110,
place = {United States},
year = {2011},
month = {9}
}