Luke W. Campbell
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View article: Methods, systems, and computer-readable storage media for enhanced phase-contrast x-ray imaging
Methods, systems, and computer-readable storage media for enhanced phase-contrast x-ray imaging Open
Systems and methods that directly image attenuation-based object grid, use a source grid to improve imaging of the object grid using a high-energy polychromatic source, and use a detector grid having gratings oriented substantially orthogo…
View article: Serial Moire scanning phase contrast x-ray imaging
Serial Moire scanning phase contrast x-ray imaging Open
Method include emitting x-rays from an x-ray source, directing a first portion of the x-rays through an object grating situated adjacent to an object while the object is scanned relative to the object grating along a scan direction, direct…
View article: Progress on Associated-Particle Imaging Algorithms, 2022
Progress on Associated-Particle Imaging Algorithms, 2022 Open
The present work describes progress on developing imaging algorithms that use fast neutron signatures acquired using the associated-particle imaging (API) method. The present work complements ongoing work to develop neutron source and dete…
View article: Monte Carlo simulation of electron thermalization in scintillator materials: Implications for scintillator nonproportionality
Monte Carlo simulation of electron thermalization in scintillator materials: Implications for scintillator nonproportionality Open
The lack of reliable quantitative estimates of the length and time scales associated with hot electron thermalization after a gamma-ray induced energy cascade obscures the interplay of various microscopic processes controlling scintillator…
View article: Electron-phonon scattering rates in complex polar crystals
Electron-phonon scattering rates in complex polar crystals Open
The thermalization of fast electrons by phonons is studied in CsI, NaI, ${\mathrm{SrI}}_{2}$, and ${\mathrm{YAlO}}_{3}$. This numerical study uses an improvement to a recently developed method based on a density functional perturbation des…
View article: Hybrid Gama Emission Tomography (HGET): FY16 Annual Report
Hybrid Gama Emission Tomography (HGET): FY16 Annual Report Open
Current International Atomic Energy Agency (IAEA) methodologies for the verification of fresh low-enriched uranium (LEU) and mixed oxide (MOX) fuel assemblies are volume-averaging methods that lack sensitivity to individual pins. Further, …
View article: Delayed Gamma-Ray Spectroscopy for Non-Destructive Assay of Nuclear Materials
Delayed Gamma-Ray Spectroscopy for Non-Destructive Assay of Nuclear Materials Open
This project has been a collaborative effort of researchers from four National Laboratories, Lawrence Berkley National Laboratory (LBNL), Lawrence Livermore National Laboratory (LLNL), Los Alamos National Laboratory (LANL), Pacific Northwe…
View article: Delayed Gamma-Ray Spectroscopy for Non-Destructive Assay of Nuclear Materials: Final Report
Delayed Gamma-Ray Spectroscopy for Non-Destructive Assay of Nuclear Materials: Final Report Open
Author(s): Ludewigt, Bernhard; Mozin, Vladimir; Campbell, Luke; Favalli, Andrea; Hunt, Alan, W; Reedy, Edward, T; Seipel, Heather, A
View article: Delayed Gamma-Ray Spectroscopy for Non-Destructive Assay of Nuclear Materials
Delayed Gamma-Ray Spectroscopy for Non-Destructive Assay of Nuclear Materials Open
Modeling capabilities were added to an existing framework and codes were adapted as needed for analyzing experiments and assessing application-specific assay concepts including simulation of measurements over many short irradiation/spectro…
View article: Delayed Gamma-Ray Spectroscopy for Non-Destructive Assay of Nuclear Materials
Delayed Gamma-Ray Spectroscopy for Non-Destructive Assay of Nuclear Materials Open
High-energy, beta-delayed gamma-ray spectroscopy is a potential, non-destructive assay techniques for the independent verification of declared quantities of special nuclear materials at key stages of the fuel cycle and for directly assa…
View article: Calculation of energy relaxation rates of fast particles by phonons in crystals
Calculation of energy relaxation rates of fast particles by phonons in crystals Open
We present ab initio calculations of the temperature-dependent exchange of energy between a classical charged point particle and the phonons of a crystalline material. The phonons, which are computed using density functional perturbation t…