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

Journal Article · · AIP Advances
DOI:https://doi.org/10.1063/1.4975632· OSTI ID:1362037

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.

Research Organization:
NOVA Scientific Inc., Sturbridge, MA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-07ER86322; FG02-08ER86353; SC0009657
OSTI ID:
1362037
Journal Information:
AIP Advances, Vol. 7, Issue 1; ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (6)

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Real-time Crystal Growth Visualization and Quantification by Energy-Resolved Neutron Imaging journal April 2017
An interactive web-based tool to guide the preparation of neutron imaging experiments at oak ridge national laboratory journal October 2019
ImagingReso: A Tool for Neutron Resonance Imaging journal November 2017
Neutron Imaging at LANSCE—From Cold to Ultrafast journal February 2018
Energy-Resolved Neutron Imaging for Reconstruction of Strain Introduced by Cold Working journal February 2018