Verifying Neutron Tomography Performance using Test Objects

Kaestner, Anders; Lehmann, Eberhard; Hovind, Jan; Radebe, M.J.; Beer, Frikkie de; Sim, Cheul Muu

doi:10.1016/j.phpro.2013.03.016

Cited by 14 publications

(12 citation statements)

References 5 publications

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“…The sample was originally meant as reference object for quantification of the linear attenuation coefficients and characterization of corresponding contrast in white-beam neutron tomography. Kaestner et al (2013) presented the round-robin test results for the case of the ICON (Kaestner et al, 2011) and NEUTRA (Lehmann et al, 2001) beamlines at PSI.…”

Section: Sample Descriptionmentioning

confidence: 99%

“…We present in this paper a TOF wavelength-dispersive neutron tomography study of a reference sample made of several metallic components, namely aluminium, iron, copper, lead, nickel and titanium. The sample was originally designed for contrast analysis in white-beam neutron tomography, as a round-robin facility reference (Kaestner et al, 2013). This study already indicated that there are differences in attenuation coefficients depending on the neutron spectrum.…”

Section: Introductionmentioning

confidence: 99%

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Bragg-edge attenuation spectra at voxel level from 4D wavelength-resolved neutron tomography

et al. 2020

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4D wavelength-resolved neutron tomography of a reference sample made of several polycrystalline materials, namely nickel, iron, titanium, lead, copper and aluminium, is presented. Data were acquired using the time-of-flight transmission imaging method at the IMAT beamline at the ISIS pulsed neutron source. Wavelength-dispersive tomography reconstruction was computed using filtered back projection, allowing wavelength-resolved total-cross-section retrieval for each voxel in the reconstructed volume of the sample. The need for background correction to enable quantitative results and analysis is discussed, and the achieved 3D spatial resolution with respect to the obtained Bragg-edge pattern quality is investigated.

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Section: Sample Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bragg-edge attenuation spectra at voxel level from 4D wavelength-resolved neutron tomography

et al. 2020

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“…In this experiment, the attenuation values from the 6 Li deposits are in the same range as those of the natural Li electrode and of the Li reacted with Al, leading to difficulties in distinguishing between each of these domains. Indeed, even if the voxel size is larger than the characteristic diameter of mossy Li or Li dendrites (Bai et al, 2016), the 6 Li deposits are visible because of the partial volume effect (Santago and Gage, 1995;Kaestner et al, 2013). Typically, the attenuation coefficient of voxels partially occupied by both deposits and electrolyte will be intermediate between the attenuation of the individual components.…”

Section: Resultsmentioning

confidence: 99%

Tomography Imaging of Lithium Electrodeposits Using Neutron, Synchrotron X-Ray, and Laboratory X-Ray Sources: A Comparison

et al. 2021

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X-ray and neutron imaging are widely employed for battery materials, thanks to the possibility to perform noninvasive in situ and in operando analyses. X-ray tomography can be performed either in synchrotron or in laboratory facilities and is particularly well-suited to analyze bulk materials and electrode/electrolyte interfaces. Several post-lithium-ion (Li-ion) devices, such as Li–sulfur, Li–O2, or all-solid-state Li batteries, have an anode made of metallic Li in common. The main failure mode of Li batteries is the inhomogeneity of the Li electrodeposits onto the Li anode during charge steps, leading to dendrite growth and low Coulombic efficiency. X-ray tomography is a powerful tool for studying dendrites as it provides useful information about their locations, dynamics, and microstructures. So far, the use of neutron tomography is scarcely reported for Li deposit analysis due to the difficulty in reaching sufficient image resolution to capture the deposit microstructure, that is, typically below 10–20 µm. The very different interactions of X-rays and neutrons with Li, which has significantly different opacity in the two cases, make the two techniques highly complementary. Notably, the capacity of neutrons to discern different Li isotopes is pivotal to getting an insight into the composition of Li deposits by distinguishing between Li originating from an electrode (6Li in this study) and Li originating from the Li salt electrolyte (mainly in 7Li here). Indeed, the theoretical linear neutron attenuation coefficient of 6Li is about 15 and 2,000 times larger than that of natural Li and 7Li, respectively. Therefore, a high imaging contrast difference is obtained between 6Li (high attenuation) and natural Li and 7Li (lower attenuations), which could allow a better understanding of the origin of the Li comprising the electrodeposits. In this work, we report, as a proof of concept, an in situ neutron tomography imaging of Li electrodeposits in a cycled Li symmetric cell. The electrochemical cell comprises a natural Li electrode, a 6Li electrode, and a deuterated liquid electrolyte. The neutron tomographies are compared with X-ray tomography images of the same electrochemical cell acquired both at an X-ray synchrotron beamline and at a laboratory X-ray tomograph. Neutron tomography is shown to be compatible with in situ analysis and capable of capturing the overall morphology of the Li deposits in good accordance with X-ray tomography analyses.

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“…With this -based neutron imager we can do a scan of similar quality in two hours or less. Figure 7 shows a test device developed at PSI [6] to evaluate the contrast revealed by a neutron imaging beamline and its detector. It is an aluminum cylinder, with smaller cylindrical inserts of other metals.…”

Section: Neutron Tomographymentioning

confidence: 99%

“…The scintillating material is usually ZnS:Cu, emitting around 531 nm, near the optimum of s sensitivity. This scintillator is used in powder form, also known as the green phosphor P31, mixed with 6 LiF powder. The 6 Li (highly enriched) here acts as the neutron converter through the fission reaction n( 6 Li, α) 3 H. Both fission fragments have a range of few tens of microns in the compound.…”

Section: Introductionmentioning

confidence: 99%

Neutron imaging and tomography with MCPS

Pinto¹,

Ortega²,

Ritzau³

et al. 2017

J. Inst.

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A neutron imaging detector based on neutron-sensitive microchannel plates (MCPS) was constructed and tested at beamlines of thermal and cold neutrons. The MCPS are made of a glass mixture containing 10B and natural Gd, which makes the bulk of the MCP an efficient neutron converter. Contrary to the neutron-sensitive scintillator screens normally used in neutron imaging, spatial resolution is not traded off with detection efficiency. While the best neutron imaging scintillators have a detection efficiency around a percent, a detection efficiency of around 50% for thermal neutrons and 70% for cold neutrons has been demonstrated with these MCPS earlier. Our tests show a performance similar to conventional neutron imaging detectors, apart from the orders of magnitude better sensitivity. We demonstrate a spatial resolution better than 150 μm. The sensitivity of this detector allows fast tomography and neutron video recording, and will make smaller reactor sites and even portable sources suitable for neutron imaging.

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Verifying Neutron Tomography Performance using Test Objects

Cited by 14 publications

References 5 publications

Bragg-edge attenuation spectra at voxel level from 4D wavelength-resolved neutron tomography

Bragg-edge attenuation spectra at voxel level from 4D wavelength-resolved neutron tomography

Tomography Imaging of Lithium Electrodeposits Using Neutron, Synchrotron X-Ray, and Laboratory X-Ray Sources: A Comparison

Neutron imaging and tomography with MCPS

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