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Title: Teflon Examination

Abstract

In this document, we outline an experiment performed at LLNL to evaluate the radiation sensitivity of polytetrafluoroethylene (PTFE) and a PTFE isomer, fluorinated ethylene propylene (FEP). We demonstrate that PTFE, a material currently used for assessing MicroCT system stability, shows higher radiation-dependent change in x-ray attenuation than FEP. Specifically, for a dose of approximately 1.44 x 10 3 Gy, the linear attenuation coefficient (LAC) of PTFE changes by 0.8 ± 0.1 %. During the same irradiation period, the LAC for FEP changes by 0.02 ± 0.1 %, which is within the statistical uncertainty of the measurement. Due to its higher resistance to radiation damage, we recommend that LLNL and partner labs operating under the Department of Homeland Security’s Explosives Division (DHS EXD) transition to the use of FEP as a reference material in place of PTFE.

Authors:
 [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1368026
Report Number(s):
LLNL-TR-730131
DOE Contract Number:
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 62 RADIOLOGY AND NUCLEAR MEDICINE; 47 OTHER INSTRUMENTATION

Citation Formats

Dooraghi, A. A., Seetho, I., Smith, J.. A., and Brown, W. D. Teflon Examination. United States: N. p., 2017. Web. doi:10.2172/1368026.
Dooraghi, A. A., Seetho, I., Smith, J.. A., & Brown, W. D. Teflon Examination. United States. doi:10.2172/1368026.
Dooraghi, A. A., Seetho, I., Smith, J.. A., and Brown, W. D. Thu . "Teflon Examination". United States. doi:10.2172/1368026. https://www.osti.gov/servlets/purl/1368026.
@article{osti_1368026,
title = {Teflon Examination},
author = {Dooraghi, A. A. and Seetho, I. and Smith, J.. A. and Brown, W. D.},
abstractNote = {In this document, we outline an experiment performed at LLNL to evaluate the radiation sensitivity of polytetrafluoroethylene (PTFE) and a PTFE isomer, fluorinated ethylene propylene (FEP). We demonstrate that PTFE, a material currently used for assessing MicroCT system stability, shows higher radiation-dependent change in x-ray attenuation than FEP. Specifically, for a dose of approximately 1.44 x 103 Gy, the linear attenuation coefficient (LAC) of PTFE changes by 0.8 ± 0.1 %. During the same irradiation period, the LAC for FEP changes by 0.02 ± 0.1 %, which is within the statistical uncertainty of the measurement. Due to its higher resistance to radiation damage, we recommend that LLNL and partner labs operating under the Department of Homeland Security’s Explosives Division (DHS EXD) transition to the use of FEP as a reference material in place of PTFE.},
doi = {10.2172/1368026},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Apr 27 00:00:00 EDT 2017},
month = {Thu Apr 27 00:00:00 EDT 2017}
}

Technical Report:

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