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Title: Non-contact measurement of partial gas pressure and distribution of elemental composition using energy-resolved neutron imaging

Neutron resonance absorption imaging is a non-destructive technique that can characterize the elemental composition of a sample by measuring nuclear resonances in the spectrum of a transmitted beam. Recent developments in pixelated time-of-flight imaging detectors coupled with pulsed neutron sources pose new opportunities for energy-resolved imaging. In this paper we demonstrate non-contact measurements of the partial pressure of xenon and krypton gases encapsulated in a steel pipe while simultaneously passing the neutron beam through high-Z materials. The configuration was chosen as a proof of principle demonstration of the potential to make non-destructive measurement of gas composition in nuclear fuel rods. The pressure measured from neutron transmission spectra (~739 ± 98 kPa and ~751 ± 154 kPa for two Xe resonances) is in relatively good agreement with the pressure value of ~758 ± 21 kPa measured by a pressure gauge. This type of imaging has been performed previously for solids with a spatial resolution of ~ 100 μm. In the present study it is demonstrated that the high penetration capability of epithermal neutrons enables quantitative mapping of gases encapsulate within high-Z materials such as steel, tungsten, urania and others. This technique may be beneficial for the non-destructive testing of bulk compositionmore » of objects (such as spent nuclear fuel assemblies and others) containing various elements opaque to other more conventional imaging techniques. As a result, the ability to image the gaseous substances concealed within solid materials also allows non-destructive leak testing of various containers and ultimately measurement of gas partial pressures with sub-mm spatial resolution.« less
Authors:
 [1] ;  [2] ; ORCiD logo [2] ;  [2] ;  [2] ;  [2] ;  [1]
  1. Univ. of California, Berkeley, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Grant/Contract Number:
FG02-07ER86322; FG02-08ER86353; SC0009657
Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Research Org:
NOVA Scientific Inc., Sturbridge, MA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1362037

Tremsin, A. S., Losko, A. S., Vogel, S. C., Byler, D. D., McClellan, K. J., Bourke, M. A. M., and Vallerga, J. V.. Non-contact measurement of partial gas pressure and distribution of elemental composition using energy-resolved neutron imaging. United States: N. p., Web. doi:10.1063/1.4975632.
Tremsin, A. S., Losko, A. S., Vogel, S. C., Byler, D. D., McClellan, K. J., Bourke, M. A. M., & Vallerga, J. V.. Non-contact measurement of partial gas pressure and distribution of elemental composition using energy-resolved neutron imaging. United States. doi:10.1063/1.4975632.
Tremsin, A. S., Losko, A. S., Vogel, S. C., Byler, D. D., McClellan, K. J., Bourke, M. A. M., and Vallerga, J. V.. 2017. "Non-contact measurement of partial gas pressure and distribution of elemental composition using energy-resolved neutron imaging". United States. doi:10.1063/1.4975632. https://www.osti.gov/servlets/purl/1362037.
@article{osti_1362037,
title = {Non-contact measurement of partial gas pressure and distribution of elemental composition using energy-resolved neutron imaging},
author = {Tremsin, A. S. and Losko, A. S. and Vogel, S. C. and Byler, D. D. and McClellan, K. J. and Bourke, M. A. M. and Vallerga, J. V.},
abstractNote = {Neutron resonance absorption imaging is a non-destructive technique that can characterize the elemental composition of a sample by measuring nuclear resonances in the spectrum of a transmitted beam. Recent developments in pixelated time-of-flight imaging detectors coupled with pulsed neutron sources pose new opportunities for energy-resolved imaging. In this paper we demonstrate non-contact measurements of the partial pressure of xenon and krypton gases encapsulated in a steel pipe while simultaneously passing the neutron beam through high-Z materials. The configuration was chosen as a proof of principle demonstration of the potential to make non-destructive measurement of gas composition in nuclear fuel rods. The pressure measured from neutron transmission spectra (~739 ± 98 kPa and ~751 ± 154 kPa for two Xe resonances) is in relatively good agreement with the pressure value of ~758 ± 21 kPa measured by a pressure gauge. This type of imaging has been performed previously for solids with a spatial resolution of ~ 100 μm. In the present study it is demonstrated that the high penetration capability of epithermal neutrons enables quantitative mapping of gases encapsulate within high-Z materials such as steel, tungsten, urania and others. This technique may be beneficial for the non-destructive testing of bulk composition of objects (such as spent nuclear fuel assemblies and others) containing various elements opaque to other more conventional imaging techniques. As a result, the ability to image the gaseous substances concealed within solid materials also allows non-destructive leak testing of various containers and ultimately measurement of gas partial pressures with sub-mm spatial resolution.},
doi = {10.1063/1.4975632},
journal = {AIP Advances},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {1}
}