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Title: SU-F-T-127: Charged Particle Transport in Condensed Media

Abstract

Purpose: Provide quality interaction cross sections for charged particle Monte Carlo (MC) track structure codes and evaluate low energy electron transport in condensed media. Methods: MC methods and codes are often used to model or simulate charged particle radiation transport in matter. Detailed (or event-by-event) track structure simulations are of special interest for the modeling of the physical and chemical stages of radiation action with matter and the initial radiation damage to biological systems. They require reliable interaction cross sections of all radiation qualities considered (e.g., electrons, protons, alpha particles, light and heavy ions) with the target material under consideration, mainly in the condensed phase, including liquids and solids. Interaction cross sections are calculated using the dielectric formalism, a mixture of first principles, theoretical modeling and experimental information for bulk and surface transport and implemented into MC track structure codes. Secondary electron emission yields from amorphous solid water (ASW) and thin metal foils (copper and gold) after fast proton impact are simulated and measured experimentally. Results: After considering different transport models for bulk and surface transport and a careful modeling of the experimental geometry, simulated secondary electron emission yields follow the trends of experimental data well. Furthermore, yields for electronmore » emissions below 50 eV are sensitive to differential elastic scattering cross sections. Conclusion: Low-energy electron transport in condensed media is still a challenge for detailed track structure simulation codes. Interaction cross-sections, transport models, and target geometry need to be considered adequately. The research was funded in part by NSF Major Research Instrumentation Program 2009, Award Number: 0923270 and by NIH/NCI R01 CA93351.« less

Authors:
; ;  [1];  [1];  [2]
  1. East Carolina University, Greenville, NC (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22642368
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 43; Journal Issue: 6; Other Information: (c) 2016 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; CHARGED-PARTICLE TRANSPORT; CROSS SECTIONS; EXPERIMENTAL DATA; HEAVY IONS; INTERACTIONS; MONTE CARLO METHOD; PARTICLE TRACKS; PRODUCTIVITY; RADIATION EFFECTS; SIMULATION; VISIBLE RADIATION

Citation Formats

Dingfelder, M, Maertz, E, Shinpaugh, J, McLawhorn, R, and Carolina Radiation Medicine, Greenville, NC. SU-F-T-127: Charged Particle Transport in Condensed Media. United States: N. p., 2016. Web. doi:10.1118/1.4956263.
Dingfelder, M, Maertz, E, Shinpaugh, J, McLawhorn, R, & Carolina Radiation Medicine, Greenville, NC. SU-F-T-127: Charged Particle Transport in Condensed Media. United States. doi:10.1118/1.4956263.
Dingfelder, M, Maertz, E, Shinpaugh, J, McLawhorn, R, and Carolina Radiation Medicine, Greenville, NC. Wed . "SU-F-T-127: Charged Particle Transport in Condensed Media". United States. doi:10.1118/1.4956263.
@article{osti_22642368,
title = {SU-F-T-127: Charged Particle Transport in Condensed Media},
author = {Dingfelder, M and Maertz, E and Shinpaugh, J and McLawhorn, R and Carolina Radiation Medicine, Greenville, NC},
abstractNote = {Purpose: Provide quality interaction cross sections for charged particle Monte Carlo (MC) track structure codes and evaluate low energy electron transport in condensed media. Methods: MC methods and codes are often used to model or simulate charged particle radiation transport in matter. Detailed (or event-by-event) track structure simulations are of special interest for the modeling of the physical and chemical stages of radiation action with matter and the initial radiation damage to biological systems. They require reliable interaction cross sections of all radiation qualities considered (e.g., electrons, protons, alpha particles, light and heavy ions) with the target material under consideration, mainly in the condensed phase, including liquids and solids. Interaction cross sections are calculated using the dielectric formalism, a mixture of first principles, theoretical modeling and experimental information for bulk and surface transport and implemented into MC track structure codes. Secondary electron emission yields from amorphous solid water (ASW) and thin metal foils (copper and gold) after fast proton impact are simulated and measured experimentally. Results: After considering different transport models for bulk and surface transport and a careful modeling of the experimental geometry, simulated secondary electron emission yields follow the trends of experimental data well. Furthermore, yields for electron emissions below 50 eV are sensitive to differential elastic scattering cross sections. Conclusion: Low-energy electron transport in condensed media is still a challenge for detailed track structure simulation codes. Interaction cross-sections, transport models, and target geometry need to be considered adequately. The research was funded in part by NSF Major Research Instrumentation Program 2009, Award Number: 0923270 and by NIH/NCI R01 CA93351.},
doi = {10.1118/1.4956263},
journal = {Medical Physics},
number = 6,
volume = 43,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}