The effect of the imaging geometry and the impact of neutron scatter on the detection of small features in accelerator-based fast neutron radiography

Ambrosi, Richard M.; Watterson, J.I.W.

doi:10.1016/j.nima.2003.12.042

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…Similarly to neutron beams produced in the previous system the spread of the neutron energy is about 600 keV for the windowed gas target. [14]. This large energy spread is of no consequence, since the dip and peak in the carbon cross-section at 6.8 and 7.8 MeV are both broad.…”

Section: Pos(fnda2006)084mentioning

confidence: 96%

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Prospects of Fast-Neutron Resonance Radiography and Requirements for Instrumentation

Vartsky¹

2007

Proceedings of International Workshop on Fast Neutron Detectors and Applications — PoS(FNDA2006)

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Section: Pos(fnda2006)084mentioning

confidence: 96%

“…Prospects of FNRR D. Vartsky neutron source, detectors and system simulation has been performed in collaboration with the group of the University of Witwatersrand, SA [13][14][15].…”

Section: Pos(fnda2006)084mentioning

confidence: 99%

Prospects of Fast-Neutron Resonance Radiography and Requirements for Instrumentation

Vartsky¹

2007

Proceedings of International Workshop on Fast Neutron Detectors and Applications — PoS(FNDA2006)

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“…In addition to these uses, energy-selective imaging can be used to investigate the performance of scintillators and imaging systems as functions of incident neutron energy in order to understand characteristics and to choose or develop optimal components for neutron imaging. [67][68][69] …”

Section: High-energy Neutron Imagingmentioning

confidence: 99%

Neutron Imaging at LANSCE—From Cold to Ultrafast

et al. 2018

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(Lujan center), Flight Path 5 beam line and continues to be refined. Applications include: imaging of metallic and ceramic nuclear fuels, fission gas measurements, tomography of fossils and studies of dopants in scintillators. The technique provides the ability to characterize materials opaque to thermal neutrons and to utilize neutron resonance analysis codes to quantify isotopes to within 0.1 atom %. The latter also allows measuring fuel enrichment levels or the pressure of fission gas remotely. More recently, the cold neutron spectrum at the ASTERIX beam line, also located at Target 1, was used to demonstrate phase contrast imaging with pulsed neutrons. This extends the capabilities for imaging of thin and transparent materials at LANSCE. In contrast, high-energy neutron imaging at LANSCE, using unmoderated fast spallation neutrons from Target 4 [Weapons Neutron Research (WNR) facility] has been developed for applications in imaging of dense, thick objects. Using fast (ns), time-of-flight imaging, enables testing and developing imaging at specific, selected MeV neutron energies. The 4FP-60R beam line has been reconfigured with increased shielding and new, larger collimation dedicated to fast neutron imaging. The exploration of ways in which pulsed neutron beams and the time-of-flight method can provide additional benefits is continuing. We will describe the facilities and instruments, present application examples and recent results of all these efforts at LANSCE.

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“…In 1972, the first commercial CT machine was developed by Sir Godfrey Hounsfield [ 4 ], and in the decades that followed, applications of computed tomography using X-rays have been the subject of intense study, both in the medical and industrial fields. In parallel, neutron radiography was developed in the 1930s [ 5 , 6 ] and has been used to successfully produce images of reasonable quality in the subsequent decades [ 7 , 8 ]. Additionally, parametric studies to understand image formation in neutron radiography have been performed (for fast neutrons, for example, see [ 9 ]).…”

Section: Introductionmentioning

confidence: 99%

On a Method For Reconstructing Computed Tomography Datasets from an Unstable Source

et al. 2020

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As work continues in neutron computed tomography, at Los Alamos Neutron Science Center (LANSCE) and other locations, source reliability over the long imaging times is an issue of increasing importance. Moreover, given the time commitment involved in a single neutron image, it is impractical to simply discard a scan and restart in the event of beam instability. In order to mitigate the cost and time associated with these options, strategies are presented in the current work to produce a successful reconstruction of computed tomography data from an unstable source. The present work uses a high energy neutron tomography dataset from a simulated munition collected at LANSCE to demonstrate the method, which is general enough to be of use in conjunction with unstable X-ray computed tomography sources as well.

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The effect of the imaging geometry and the impact of neutron scatter on the detection of small features in accelerator-based fast neutron radiography

Cited by 6 publications

References 10 publications

Prospects of Fast-Neutron Resonance Radiography and Requirements for Instrumentation

Prospects of Fast-Neutron Resonance Radiography and Requirements for Instrumentation

Neutron Imaging at LANSCE—From Cold to Ultrafast

On a Method For Reconstructing Computed Tomography Datasets from an Unstable Source

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