Neutron imaging detector with 2 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="mml5" display="inline" overflow="scroll" altimg="si3.gif"><mml:mi mathvariant="normal">μ</mml:mi><mml:mi mathvariant="normal">m</mml:mi></mml:math> spatial resolution based on event reconstruction of neutron capture in gadolinium oxysulfide scintillators

Hussey, Daniel S.; LaManna, Jacob M.; Baltic, Elias; Jacobson, David L.

doi:10.1016/j.nima.2017.05.035

Cited by 60 publications

(64 citation statements)

References 13 publications

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“…Neutron imaging with CB-KID was modelled based on the deposition of energy by the 4 He, 7 Li and electrons in the Nb segments within the X and Y meander layers. Deposition of 6 energy by a particle in a meander line segment was considered a hit which would cause measurable signal in CB-KID.…”

Section: Phits Simulationsmentioning

confidence: 99%

“…Recently there has been a drive to improve the spatial resolution of neutron radiography systems [6,7]. The current-biased kinetic inductance detector (CB-KID) was developed with the goal of realizing neutron imaging with high sensitivity, fast response, and high spatial and temporal resolution [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…A neutron beam irradiates the sample before passing into the detector. Neutrons are converted within an enriched boron-10 layer in CB-KID, which releases high-energy 4 He and 7 Li nuclei. One of these nuclei propagates backwards into the detector and creates local hot spots 1 The maximum spatial resolution that is theoretically achievable with CB-KID is set by the pitch of the segments in the meander lines, which in turn sets the pixel density of the resulting images.…”

Section: Introductionmentioning

confidence: 99%

“…A loss of sharpness occurs as the 4 He and 7 Li nuclei spread out randomly within the solid angle 4π from the neutron-10 B reaction points. Thus the x,y position of a nucleus detected as it crosses the X and Y meander lines is different from the x',y' position where the original 10 B(n,α) 7 Li reaction that created the nucleus occurred.…”

Section: Introductionmentioning

confidence: 99%

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Monte Carlo radiation transport modelling of the current-biased kinetic inductance detector

Malins

Machida

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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Highlights Model developed of the current-biased kinetic inductance detector (CB-KID) for PHITS radiation transport simulations. Simulations modelled neutron, 4 He, 7 Li, photon and electron transport within CB-KID, and neutron-10 B reactions.  Analysed factors affecting quality of images obtained using CB-KID.  Simulations of 10 B dot arrays suggested sub 10 µm spatial resolution is feasible with current CB-KID design.  Detection efficiency of CB-KID investigated using both Monte Carlo simulations and an analytical equation. 2 Abstract Radiation transport simulations were used to analyse neutron imaging with the currentbiased kinetic inductance detector (CB-KID). The PHITS Monte Carlo code was applied for simulating neutron, 4 He, 7 Li, photon and electron transport, 10 B(n,α) 7 Li reactions, and energy deposition by particles within CB-KID. Slight blurring in simulated CB-KID images originated from 4 He and 7 Li ions spreading out in random directions from the 10 B conversion layer in the detector prior to causing signals in the X and Y superconducting Nb nanowire meander lines. 478 keV prompt gamma rays emitted by 7 Li nuclei from neutron-10 B reactions had negligible contribution to the simulated CB-KID images. Simulated neutron images of 10 B dot arrays indicate that sub 10 µm resolution imaging should be feasible with the current CB-KID design.The effect of the geometrical structure of CB-KID on the intrinsic detection efficiency was calculated from the simulations. An analytical equation was then developed to approximate this contribution to the detection efficiency. Detection efficiencies calculated in this study are upper bounds for the reality as the effects of detector temperature, the bias current, signal processing and dead-time losses were not taken into account. The modelling strategies employed in this study could be used to evaluate modifications to the CB-KID design prior to actual fabrication and testing, conveying a time and cost saving.

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Section: Phits Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Monte Carlo radiation transport modelling of the current-biased kinetic inductance detector

Malins

Machida

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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“…Event centroiding, where the center of gravity of a detection event covering multiple pixels on an imaging detector is determined to sub-pixel resolution, is such a method. While pixel or event centroiding has been applied to neutron imaging at continuous wave neutron sources such as PSI [29] or NIST [30], it has not been demonstrated for energy-resolved neutron imaging at a pulsed neutron source where thousands of radiographs are acquired for each neutron pulse. Current methods of neutron centroiding involve charge pulse mode with the detector, where each individual neutron supplies a charge distribution in the event and can distinguish between overlapping events.…”

Section: Introductionmentioning

confidence: 99%

Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE

2018

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Abstract:The energy-dependence of the neutron cross section provides vastly different contrast mechanisms than polychromatic neutron radiography if neutron energies can be selected for imaging applications. In recent years, energy-resolved neutron imaging (ERNI) with epi-thermal neutrons, utilizing neutron absorption resonances for contrast as well as for quantitative density measurements, was pioneered at the Flight Path 5 beam line at LANSCE and continues to be refined. Here we present event centroiding, i.e., the determination of the center-of-gravity of a detection event on an imaging detector to allow sub-pixel spatial resolution and apply it to the many frames collected for energy-resolved neutron imaging at a pulsed neutron source. While event centroiding was demonstrated at thermal neutron sources, it has not been applied to energy-resolved neutron imaging, where the energy resolution requires to be preserved, and we present a quantification of the possible resolution as a function of neutron energy. For the 55 µm pixel size of the detector used for this study, we found a resolution improvement from~80 µm to~22 µm using pixel centroiding while fully preserving the energy resolution.

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Synchrotron Radiography for a Proton Exchange Membrane (PEM) Electrolyzer

et al. 2020

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In‐plane synchrotron radiography with a resolution of a few micrometers was applied to study transport processes within a Proton Exchange Membrane (PEM) electrolyzer cell. The degradation process of the catalyst layer, gas production with bubble formation at the catalyst layer and in the porous transport layer (PTL) was analyzed. From this, a new cell design was developed that allows for high X‐ray transmittances at the membrane plane in the in‐plane viewing direction. During the measurement, a bubble growth and movement was observed. Furthermore, a detachment of catalytic material from the catalyst layer was detected. Afterwards, a post mortem EDX analysis was conducted to determine the position of the catalyst particles. Despite Iridium being initially used as the anode catalyst and platinum as the cathode catalyst, the EDX measurement revealed Pt and Ir particles on both electrodes following cell operation.

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Neutron imaging detector with 2 μm spatial resolution based on event reconstruction of neutron capture in gadolinium oxysulfide scintillators

Cited by 60 publications

References 13 publications

Monte Carlo radiation transport modelling of the current-biased kinetic inductance detector

Monte Carlo radiation transport modelling of the current-biased kinetic inductance detector

Event Centroiding Applied to Energy-Resolved Neutron Imaging at LANSCE

Synchrotron Radiography for a Proton Exchange Membrane (PEM) Electrolyzer

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