Dr. Nerine J. Cherepy Profile

Dr. Nerine J. Cherepy

Research Scientist at Lawrence Livermore National Lab

SPIE Involvement:

Conference Chair | Editor | Author

Area of Expertise:

scintillators , transparent ceramics , radiation detectors , optical materials , optical sensors , gamma spectroscopy

Websites:

Company Website

Profile Summary

New light emitting materials and instrumentation for ionizing radiation detection, lighting, optical sensors and laser systems. Development of transparent ceramics and halide crystals offering high resolution for gamma spectroscopy. Plastic scintillators with modifications for improved utility in ionizing radiation detectors such as incorporation of high-Z constituents for gamma sensitivity and increased light yield by employing optimized fluors. Scintillator detector development for gamma spectroscopy, neutron detection and radiography. Development of new phosphors for fluorescent and solid-state lighting that reduce rare-earth content while providing high efficacy and desired white light spectra. New bright scintillator screens for X-ray and neutron imaging to increase signal-to-noise and enhance throughput while providing desired spatial resolution.

Publications (55)

Proceedings Article | 4 October 2023 Presentation

Presentation

High resolution lens-coupled MeV x-radiography of dense additively manufactured objects

Nerine Cherepy, Daniel Schneberk, Zachary Seeley, Colby McNamee, Stephen Payne, Paul Carriere, Robert Berry, Jarvis Caffrey

Proceedings Volume PC12696, PC1269606 (2023) https://doi.org/10.1117/12.2680643

KEYWORDS: Inspection, Additive manufacturing, Metals, Spatial resolution, Scintillators, X-rays, X-ray computed tomography, Imaging systems, Cameras, Amorphous silicon

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Additive manufacturing techniques are being extended to refractory metals and other metals capable of operating in high-temperature environments. Many of these metals are high-Z and high density necessitating higher x-ray inspection energies. 3D volumetric X-ray computed tomography (X-ray CT) has emerged as a strategic inspection choice for these parts. The internal channels and features of these parts are often complicated and can articulate in spiral configurations for longer chord lengths that are difficult to inspect in a single or ensemble of radiographs. In particular, it is the entire 3D structure of the part that is of interest not just one or two locations in the volume. At the same time, 3D printing is extending the spatial resolution limits for small, manufactured details and defects, which impacts the target resolution. CT inspection requirements for these parts include resolution down to 0.1 mm at MeV energies. In this context, properties of the GLO transparent ceramic scintillator (Gd0.3Lu1.6Eu0.1O3): high-stopping power, high-brightness, high transparency in large area plates combined to produce high intrinsic spatial resolution, could be pivotal for delivering 3D inspections of these parts. Radiabeam LLC has configured an area-detector CT camera-scintillator system employing GLO (other scintillators have been used in this system) in combination with the ARCIS LINAC (adjustable from 2-9 MeV). A variety of AM-fabricated refractory metal components have been scanned at 7.8 MeV, providing robust transmitted signal for high density parts with 2-3” chord lengths, in parts that are up to 6 inches in diameter. Lens-coupled X-ray CT using a transparent scintillator imaged on a sCMOS camera obtains higher spatial resolution than the more commonly employed phosphor-enhanced amorphous silicon (A-Si) panels. The result is higher contrast imaging due to increased stopping power. Interior features of the additively manufactured components have been resolved down to a voxel size of 80 microns. Inspection data from this system with representative AM parts will be reviewed and evaluated.

Proceedings Article | 4 October 2023 Presentation

Presentation

Large volume bismuth-loaded plastics for portal monitors

Sean O'Neal, Saphon Hok, Nerine Cherepy, Stephen Payne, Charles Hurlbut

Proceedings Volume PC12696, PC126960C (2023) https://doi.org/10.1117/12.2682491

KEYWORDS: Plastics, Scintillators, Bismuth

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Proceedings Article | 3 October 2023 Paper

Paper

Dual particle imaging with iridium-bismuth and fast-curing plastic scintillators

A. Decker, J. Manfredi, M. Febbraro, N. Cherepy, S. Hok, P. Hausladen, J. Hayward

Proceedings Volume 12696, 1269608 (2023) https://doi.org/10.1117/12.2682216

KEYWORDS: X-rays, Plastics, Radiography, Signal to noise ratio, Scintillators, Modulation transfer functions, Composites, X-ray imaging, Detector arrays, Polishing

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Proceedings Article | 3 October 2023 Presentation + Paper

Presentation + Paper

Improved gamma imaging at NIF using the ceramic scintillator GYGAG

M. Rubery, D. Fittinghoff, N. Cherepy, C. Danly, V. Geppert-Kleinrath, V. Fatherley, H. Jorgenson, M. Freeman, C. Wilde, P. Volegov, M. Durocher, G. Saavedra, A. Moore, D. Schlossberg, E. Casco, S. Payne, R. Osborne, Z. Seeley, C. McNamee, C. Waltz

Proceedings Volume 12696, 1269605 (2023) https://doi.org/10.1117/12.2682629

KEYWORDS: Scintillators, National Ignition Facility, Imaging systems, Gamma ray imaging, Cameras, Spatial resolution, Point spread functions, Ceramics, Tungsten, Relays

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Proceedings Article | 3 October 2023 Presentation + Paper

Presentation + Paper

Improved image stitching method for neutron imaging of large objects with small beam size

Matthew Bisbee, Ibrahim Oksuz, Quinnan Hetrick, Nerine Cherepy, Andy Townsend, Lei Cao

Proceedings Volume 12696, 1269607 (2023) https://doi.org/10.1117/12.2677150

KEYWORDS: Tunable filters, Radiography, Image filtering, Digital filtering, Computed tomography, Spatial resolution, Scintillators

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Proceedings Article | 3 October 2023 Presentation + Paper

Presentation + Paper

Direct fabrication of pixelated detector arrays for high-energy x-ray imaging via additive manufacturing

Joshua Smith, Ross Osborne, Timothy Yee, Colby McNamee, Phillip Kerr, Nerine Cherepy, Zachary Seeley, Stephen Payne

Proceedings Volume 12696, 1269609 (2023) https://doi.org/10.1117/12.2689039

KEYWORDS: X-ray imaging, Additive manufacturing, Printing, Reflectors, X-rays, Ceramics, Scintillators, Detector arrays, Sintering, Imaging arrays

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Proceedings Article | 15 June 2023 Presentation + Paper

Presentation + Paper

Single-step fabrication of transparent SrF2 ceramics for optical applications

Thomas Rudzik, Zachary Seeley, Nerine Cherepy, Stephen Payne

Proceedings Volume 12515, 125150B (2023) https://doi.org/10.1117/12.2661729

KEYWORDS: Ceramics, Particles, Fluoride, Depolarization, Porosity, Optical transmission, Laser scattering, Fabrication, Photomicroscopy, Sintering

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Proceedings Article | 15 June 2023 Presentation

Presentation

Transparent ceramic laser media fabricated via additive manufacturing

Ross Osborne, Ian Phillips, Nerine Cherepy, Alexander Drobshoff, Stephen Payne, Mark Dubinskii

Proceedings Volume PC12515, PC125150A (2023) https://doi.org/10.1117/12.2664173

KEYWORDS: Additive manufacturing, Ceramics, Laser manufacturing, Doping, Nanoparticles, Ions, YAG lasers, Waveguides, Rod lasers, Laser development

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Proceedings Article | 4 October 2022 Presentation + Paper

Presentation + Paper

Radiation hardness of polycrystalline ceramic scintillators for radioisotope batteries

Joshua Jarrell, Nerine Cherepy, Zachary Seeley, Erik Swanberg, Lars Voss, Clint Frye, Mark Stoyer, Roger Henderson, Rebecca Nikolic

Proceedings Volume 12241, 122410J (2022) https://doi.org/10.1117/12.2635787

KEYWORDS: Scintillators, Ions, Helium, Polonium, Absorption, Annealing, Radioisotopes, Particles, Light, Optical testing

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Proceedings Article | 4 October 2022 Presentation + Paper

Presentation + Paper

Experimental x-ray and fast neutron CT comparative analysis

M. G. Bisbee, A. J. Hardy, I. Oksuz, L. R. Cao, N. J. Cherepy, D. J. Schneberk, K. M. Champley, A. P. Townsend, K. J. Harke, J. V. Bernier, J. Tringe, S. Karimi

Proceedings Volume 12241, 122410E (2022) https://doi.org/10.1117/12.2635503

KEYWORDS: X-rays, Spatial resolution, Scintillators, Image segmentation, X-ray computed tomography, Signal attenuation, Nondestructive evaluation, X-ray imaging

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Proceedings Article | 4 October 2022 Presentation + Paper

Presentation + Paper

Large transparent ceramic garnet scintillator module

N. J. Cherepy, S. P. O'Neal, R. A. Osborne, T. J. Wineger, Z. M. Seeley, C. J. McNamee, S. A. Payne, F. Liang, H. Brands, L. Hoy, J. Verity, A. Jackson, D. Hook, L. Ruthardt, W. Johnson, T. Zhang, T. Stefanik

Proceedings Volume 12241, 1224105 (2022) https://doi.org/10.1117/12.2634325

KEYWORDS: Ceramics, Scintillators, Spectroscopy, Sensors, Garnet

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Proceedings Article | 4 October 2022 Presentation + Paper

Presentation + Paper

Comparison of thermal and fast neutron computed tomography of complex objects by additive manufacturing and electrical discharge machining

Ibrahim Oksuz, Matt Bisbee, Nerine Cherepy, Joe Tringe, Andrew Townsend, James Hall, Lei Cao

Proceedings Volume 12241, 122410D (2022) https://doi.org/10.1117/12.2635773

KEYWORDS: Radiography, 3D image processing, Additive manufacturing, Data acquisition, Computed tomography, Scintillators, Cements, Visualization, Glasses, 3D acquisition

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Proceedings Article | 3 October 2022 Presentation

Presentation

Advantages of bismuth loaded plastic scintillators (Conference Presentation)

Sean O'Neal, Nerine Cherepy, Saphon Hok, Robert Sanner, Steven Payne

Proceedings Volume PC12241, PC1224107 (2022) https://doi.org/10.1117/12.2635289

KEYWORDS: Scintillators, Bismuth, Spectroscopy, Sensors, Environmental sensing

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Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

Fast neutron computed tomography of multi-material complex objects

Ibrahim Oksuz, Matt Bisbee, Nerine Cherepy, Andrew Townsend, James Hall, Joseph Nicolino, Joseph Tringe, Lei Cao

Proceedings Volume 11838, 118380L (2021) https://doi.org/10.1117/12.2595862

KEYWORDS: Radiography, 3D image reconstruction, Tungsten, 3D image processing, Scintillators, Aluminum, Data acquisition, Video, Imaging systems, Gold

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Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

Improved x-ray CT feature identification with complementary fast neutron CT

Anthony Hardy, James Hall, Kyle Champley, Nerine Cherepy

Proceedings Volume 11838, 118380K (2021) https://doi.org/10.1117/12.2595919

KEYWORDS: X-rays, Radiography, X-ray computed tomography, X-ray imaging, Monte Carlo methods

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Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

Lens-coupled MeV x-radiography and CT with transparent ceramic GLO scintillators

N. Cherepy, Z. Seeley, D. Schneberk, C. McNamee, C. Pincus, T. Rudzik, R. Osborne, I. Phillips, J. Nicolino, J. Hall, A. Townsend, S. Payne

Proceedings Volume 11838, 118380P (2021) https://doi.org/10.1117/12.2595956

KEYWORDS: Scintillators, Radiography, Aluminum, Ceramics, X-rays, X-ray computed tomography, Cameras, Tungsten, Copper, Spatial resolution

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Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

Evaluation of novel bismuth-loaded plastic arrays for fast neutron radiography

A. Decker, N. Cherepy, S. Hok, C. McNamee, C. Delzer, P. Hausladen, J. Hayward

Proceedings Volume 11838, 118380A (2021) https://doi.org/10.1117/12.2595907

KEYWORDS: Modulation transfer functions, Signal to noise ratio, Radiography, X-rays, Composites, Sensors, Scintillators, Photons, Imaging systems, Image processing

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Proceedings Article | 5 August 2021 Presentation

Presentation

High-light yield bismuth-loaded plastic scintillators

Sean O'Neal, Nerine Cherepy, Saphon Hok, Stephen Payne

Proceedings Volume 11838, 1183808 (2021) https://doi.org/10.1117/12.2596144

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Proceedings Article | 4 August 2021 Presentation

Presentation

Pixelated dual module GYGAG directional gamma spectrometer

Erik Swanberg, Sean O'Neal, Nerine Cherepy, Zachary Seeley, Stephen Payne, Joel Kindem

Proceedings Volume 11838, 1183809 (2021) https://doi.org/10.1117/12.2596159

KEYWORDS: Spectroscopy, Scintillators, Sensors, Photodiodes, Microcontrollers, Image resolution, Garnet, Ceramics

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Proceedings Article | 2 August 2021 Presentation

Presentation

Neutron transmission imaging with a portable D-T neutron generator

Phillip Kerr, Nerine Cherepy, Jennifer Church, Gary Guethlein, James Hall, Colby McNamee, Sean O’Neal, Kyle Champley, Andrew Townsend, Mayuki Ssasagawa, Anthony Hardy

Proceedings Volume 11838, 118380M (2021) https://doi.org/10.1117/12.2596473

KEYWORDS: Imaging systems, Scintillators, X-rays, X-ray imaging, Radiography, Inspection, Digital imaging, Signal attenuation, Scattering, Light

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Proceedings Article | 19 April 2021 Presentation

Presentation

3D printed ceramic laser gain media

Zachary Seeley, Nerine Cherepy, Thomas Rudzik, Ian Phillips, Alexander Drobshoff, Timothy Yee, Oscar Herrera, Fredrick Ryerson, Tyler Wineger, Yimin Wang, Mike Squillante, Mark Dubinskiy, Stephen Payne

Proceedings Volume 11724, 117240B (2021) https://doi.org/10.1117/12.2589593

KEYWORDS: Laser optics, Ceramics, Nonimpact printing, Integrated optics, Doping, Printing, Laser development, Ions, Geometrical optics, Control systems

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Proceedings Article | 17 September 2020 Presentation + Paper

Presentation + Paper

Scintillators and detectors for MeV x-ray and neutron imaging

N. Cherepy, Z. Seeley, S. Hok, D. Schneberk, P. Kerr, S. O'Neal, I. Oksuz, M. Bisbee, L. Cao, S. Payne, R. Sanner, G. Stone, B. Hobson, G. Guethlein, J. Hall, R. Stoneking, J. Mintz, C. McNamee, P. Thelin

Proceedings Volume 11494, 114940N (2020) https://doi.org/10.1117/12.2569519

KEYWORDS: Scintillators, X-rays, Radiography, X-ray imaging, Amorphous silicon, Ceramics, Spatial resolution

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Proceedings Article | 20 August 2020 Presentation + Paper

Presentation + Paper

Characterization of a reactor-based fast neutron beam facility for fast neutron imaging

Ibrahim Oksuz, Matthew Van Zile, Matthew Bisbee, Andrew Kauffman, Joel Hatch, Praneeth Kandlakunta, Nerine Cherepy, Lei Cao

Proceedings Volume 11494, 114940T (2020) https://doi.org/10.1117/12.2569964

KEYWORDS: Gamma radiation, Collimators, Radiography, Monte Carlo methods, Bismuth

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Proceedings Article | 17 September 2019 Presentation

Presentation

Bismuth-loaded plastic scintillator portal monitors (Conference Presentation)

Sean O'Neal, Nerine Cherepy, Saphon Hok, Robert Sanner, Stephen Payne, Charles Hurlbut

Proceedings Volume 11114, 111140C (2019) https://doi.org/10.1117/12.2530251

KEYWORDS: Scintillators, Spectroscopy, Absorption, Bismuth

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Proceedings Article | 17 September 2019 Presentation

Presentation

Mini direction-finding gamma spectrometer (Conference Presentation)

Sean O'Neal, Erik Swanberg, Nerine Cherepy, Zachary Seeley, Stephen Payne, Joel Kindem

Proceedings Volume 11114, 111140B (2019) https://doi.org/10.1117/12.2531461

KEYWORDS: Spectroscopy, Ceramics, Garnet, Sensors, Environmental monitoring, Environmental sensing, Oxides, Silicon, Photodiodes, Imaging spectroscopy

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Proceedings Article | 18 September 2018 Presentation + Paper

Presentation + Paper

Digital image capture for high-resolution medical x-ray diagnostics

Theodore Morse, Nicholas Mostovych, Rajiv Gupta, Timothy Murphy, Peter Weber, Nerine Cherepy, Bernhard Adams, Thomas Bifano, Brian Stankus, Adil Akif, Angus Kingon

Proceedings Volume 10763, 107630E (2018) https://doi.org/10.1117/12.2321166

KEYWORDS: Sensors, Mammography, X-rays, Cameras, Diagnostics, Scintillators, X-ray detectors, Photodetectors, CMOS sensors, Image resolution

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Proceedings Article | 18 September 2018 Presentation

Presentation

Crystal growth and characterization of selected high-performance scintillators for national security applications (Conference Presentation)

Luis Stand, Mariya Zhuravleva, Merry Koschan, Daniel Rutstrom, Cordell Delzer, Eric Lukosi, Jason Hayward, Nerine Cherepy, Stephen Payne, Charles Melcher

Proceedings Volume 10762, 1076202 (2018) https://doi.org/10.1117/12.2323871

KEYWORDS: Scintillators, Crystals, Homeland security, Medical imaging, Image resolution, Gamma radiation, Uranium, Plutonium

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Proceedings Article | 13 September 2018 Paper

Paper

Characterization of Polyvinyl Toluene (PVT) scintillators for fast neutron imaging

Ibrahim Oksuz, William Chuirazzi, H. Paul Martinez, Nerine Cherepy, Lei Cao

Proceedings Volume 10762, 107620D (2018) https://doi.org/10.1117/12.2322828

KEYWORDS: Scintillators, Spatial resolution, Radiography, Electron multiplying charge coupled devices, Sensors, Modulation transfer functions, Scattering, Iridium

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Proceedings Article | 13 September 2018 Presentation + Paper

Presentation + Paper

Bismuth-loaded plastic scintillator portal monitors

Nerine Cherepy, Saphon Hok, Sean O'Neal, H. Paul Martinez, Patrick Beck, Robert Sanner, Owen Drury, Erik Swanberg, Stephen Payne, Charles Hurlbut

Proceedings Volume 10762, 107620B (2018) https://doi.org/10.1117/12.2320884

KEYWORDS: Scintillators, Bismuth, Spectroscopy, Radioisotopes, Gamma radiation, Sensors, Spectroscopes, Scintillation

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Proceedings Article | 11 September 2018 Presentation + Paper

Presentation + Paper

Demonstration of a high resolution x-ray detector for medical imaging

Theodore Morse, Nicholas Mostovych, Rajiv Gupta, Timothy Murphy, Peter Weber, Nerine Cherepy, Bernhard Adams, Thomas Bifano, Brian Stankus, Adil Akif, Angus Kingon

Proceedings Volume 10763, 107630C (2018) https://doi.org/10.1117/12.2320723

KEYWORDS: X-rays, Polymers, Bismuth, Channel projecting optics, Ultraviolet radiation, Modulation transfer functions, X-ray detectors, Data modeling, Capillaries, X-ray imaging, Digital x-ray imaging

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Proceedings Article | 18 October 2017 Presentation

Presentation

Cs2LiCeCl6: An intrinsic scintillator for dual gamma and neutron detector applications (Conference Presentation)

Utpal Roy, Giuseppe Camarda, Yonggang Cui, Rubi Gul, Anwar Hossain, Ge Yang, Ralph James, Steven Hunter, Patrick Beck, Nerine Cherepy, Stephen Payne

Proceedings Volume 10392, 103920O (2017) https://doi.org/10.1117/12.2276956

KEYWORDS: Sensors, Scintillators, Crystals, Homeland security, Spectroscopes, Sensor performance, Scattering, Material characterization, Semiconductors

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Proceedings Article | 18 October 2017 Presentation

Presentation

Recent advances in garnet scintillator gamma spectrometers (Conference Presentation)

Erik Swanberg, Zachary Seeley, Patrick Beck, Brian Wihl, Nerine Cherepy, Stephen Payne, Steven Hunter, Scott Fisher, Peter Thelin, Todd Stefanik, Joel Kindem

Proceedings Volume 10392, 103920X (2017) https://doi.org/10.1117/12.2276517

KEYWORDS: Sensors, Ceramics, Garnet, Scintillators, Imaging spectroscopy, Spectrometers, Gamma radiation, Gadolinium, Cerium, Photodiodes

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Proceedings Article | 29 September 2017 Presentation

Presentation

Plastic scintillators for gamma spectroscopy and neutron radiography (Conference Presentation)

H. Paul Martinez, Nerine Cherepy, Robert Sanner, Patrick Beck, Stephen Payne, Charles Hurlbut

Proceedings Volume 10392, 103920E (2017) https://doi.org/10.1117/12.2276219

KEYWORDS: Scintillators, Spectroscopy, Radiography, Bismuth, Ionizing radiation, Absorption, Iridium, Hard x-rays, Gamma radiation, Infrared sensors

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Proceedings Article | 15 September 2017 Presentation + Paper

Presentation + Paper

History and current status of strontium iodide scintillators

N. Cherepy, P. Beck, S. Payne, E. Swanberg, B. Wihl, S. Fisher, S. Hunter, P. Thelin, C. Delzer, S. Shahbazi, A. Burger, K. Shah, R. Hawrami, L. Boatner, M. Momayezi, K. Stevens, M. Randles, D. Solodovnikov

Proceedings Volume 10392, 1039202 (2017) https://doi.org/10.1117/12.2276302

KEYWORDS: Crystals, Sensors, Strontium, Radioisotopes, Scintillators, Europium, Gamma radiation, Spectrometers, Scintillation

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Proceedings Article | 2 November 2016 Presentation

Presentation

Transparent ceramic garnet scintillator optimization via composition and co-doping for high-energy resolution gamma spectrometers (Conference Presentation)

Nerine Cherepy, Stephen Payne, Zachary Seeley, Patrick Beck, Erik Swanberg, Steven Hunter

Proceedings Volume 9968, 996802 (2016) https://doi.org/10.1117/12.2237990

KEYWORDS: Scintillators, Ceramics, Garnet, Scintillation, Oxides, Spectrometers, Gadolinium, Yttrium, Gallium, Aluminum

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Proceedings Article | 2 November 2016 Presentation

Presentation

Strontium iodide gamma ray spectrometers for planetary science (Conference Presentation)

Thomas Prettyman, Emmanuel Rowe, Jarrhett Butler, Michael Groza, Arnold Burger, Naoyuki Yamashita, James Lambert, Keivan Stassun, Patrick Beck, Nerine Cherepy, Stephen Payne, Julie Castillo-Rogez, Sabrina Feldman, Carol Raymond

Proceedings Volume 9968, 99680H (2016) https://doi.org/10.1117/12.2237919

KEYWORDS: Radiation effects, Strontium, Sensors, Planetary science, Gamma radiation, Scintillators, Spectrometers, Silicon, Data modeling, Atmospheric sciences

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Proceedings Article | 2 November 2016 Presentation

Presentation

Scintillation Characterization of Doped Cesium Hafnium Chloride (Conference Presentation)

Emmanuel Rowe, Brandon Goodwin, Pijush Bhattacharya, Arnold Burger, Ashley Stowe, Nerine Cherepy, Steve Payne

Proceedings Volume 9968, 996804 (2016) https://doi.org/10.1117/12.2238318

KEYWORDS: Cesium, Hafnium, Scintillators, Scintillation, Crystals, Doping, Calcium, Ions, Radioisotopes, Spectroscopy

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Proceedings Article | 2 November 2016 Presentation

Presentation

Bismuth- and lithium-loaded plastic scintillators for gamma and neutron detection (Conference Presentation)

H. Paul Martinez, Nerine Cherepy, Robert Sanner, Patrick Beck, Eric Swanberg, Stephen Payne

Proceedings Volume 9968, 99680Q (2016) https://doi.org/10.1117/12.2238243

KEYWORDS: Scintillators, Ionizing radiation, Spectroscopy, Bismuth, Absorption, Lithium, Thermal efficiency, Defense and security, Hard x-rays, Detector development

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Proceedings Article | 4 September 2015 Paper

Paper

Transparent ceramic scintillators for gamma spectroscopy and MeV imaging

N. Cherepy, Z. Seeley, S. Payne, E. Swanberg, P. Beck, D. Schneberk, G. Stone, R. Perry, B. Wihl, S. Fisher, S. Hunter, P. Thelin, R. Thompson, N. Harvey, T. Stefanik, J. Kindem

Proceedings Volume 9593, 95930P (2015) https://doi.org/10.1117/12.2189156

KEYWORDS: Scintillators, Ceramics, Radiography, Imaging spectroscopy, Garnet, Spectroscopy, Photodiodes, Radio optics, Transparency, Crystals

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Proceedings Article | 9 September 2014 Paper

Paper

Strontium iodide instrument development for gamma spectroscopy and radioisotope identification

P. Beck, N. Cherepy, S. Payne, E. Swanberg, K. Nelson, P. Thelin, S. Fisher, S. Hunter, B. Wihl, K. Shah, R. Hawrami, A. Burger, L. Boatner, M. Momayezi, K. Stevens, M. Randles, D. Solodovnikov

Proceedings Volume 9213, 92130N (2014) https://doi.org/10.1117/12.2063056

KEYWORDS: Crystals, Sensors, Radioisotopes, Prototyping, Strontium, Scintillation, Data modeling, Performance modeling, Scintillators, Digital electronics

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Proceedings Article | 9 September 2014 Paper

Paper

High energy resolution with transparent ceramic garnet scintillators

N. Cherepy, Z. Seeley, S. Payne, P. Beck, E. Swanberg, S. Hunter, L. Ahle, S. Fisher, C. Melcher, H. Wei, T. Stefanik, Y.-S. Chung, J. Kindem

Proceedings Volume 9213, 921302 (2014) https://doi.org/10.1117/12.2062959

KEYWORDS: Ceramics, Garnet, Scintillators, Scintillation, Cerium, Oxygen, Silicon, Crystals, Gadolinium, Spectroscopy

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Proceedings Article | 5 September 2014 Paper

Paper

Advances in the growth of alkaline-Earth halide single crystals for scintillator detectors

L. Boatner, J. Ramey, J. Kolopus, J. Neal, N. Cherepy, P. Beck, S. Payne, A. Burger, E. Rowe, P. Bhattacharya

Proceedings Volume 9213, 92130J (2014) https://doi.org/10.1117/12.2063382

KEYWORDS: Crystals, Scintillators, Crystallography, Quartz, Sensors, Scintillation, Carbon, Luminescence, Europium, Ions

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Proceedings Article | 24 October 2012 Paper

Paper

Transparent garnet ceramic scintillators for gamma-ray detection

Yimin Wang, Gary Baldoni, William Rhodes, Charles Brecher, Ananya Shah, Urmila Shirwadkar, Jarek Glodo, Nerine Cherepy, Stephen Payne

Proceedings Volume 8507, 850717 (2012) https://doi.org/10.1117/12.956437

KEYWORDS: Ceramics, Garnet, Scintillators, Scintillation, Transparency, Crystals, Gamma radiation, Positron emission tomography, Optical properties, Gadolinium

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Proceedings Article | 24 October 2012 Paper

Paper

Latest advances in large diameter SrI:Eu and CLYC:Ce scintillators for isotope identification

R. Hawrami, C. Hines, I. Abselem, V. Biteman, J. Vaghini, J. Glodo, P. O'Dougherty, K. Shah, Nerine Cherepy, Stephen Payne, Arnold Burger, Lynn Boatner

Proceedings Volume 8507, 850716 (2012) https://doi.org/10.1117/12.945937

KEYWORDS: Crystals, Scintillators, Gamma radiation, Sensors, Scintillation, Quartz, Spectrometers, Chemical species, Control systems, Diamond

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Scintillator crystal detectors form the basis for many radiation detection devices. Therefore, a search for high light yield single crystal scintillators with improved energy resolution, large volume, and the potential for low cost, is an ongoing process that has increased in recent years due to a large demand in the area of nuclear isotope identification. Alkaline earth halides, elpasolites and rare earth halides are very interesting because many compositions from these crystal families provide efficient Ce3+/ Eu2+ luminescence, good proportionality and good energy resolution. They also have small band-gap leading to higher light yields. Ce3+and Eu2+ are efficient, and the emission wavelengths in the 350-500 nm region matches well with PMTs and a new generation of Siphotodiodes. In this presentation, we will the present progress made in the crystal growth of these compositions, and scintillator properties of large diameter SrI2:Eu2+ single transparent crystals. The crystals were grown successfully using the vertical Bridgeman technique. Crystals with different diameters of 1”, 1.3”, and 1.5” will be discussed. SrI2:Eu was discovered a half century ago, and was recently found to be an outstanding material for gamma ray-spectroscopy with high light yield, very good non-proportionality, and excellent energy resolution. We will also discuss growth and properties of larger Cs2LiYCl6 (CLYC) crystals. Recently, it has been shown that crystals from the elpasolite family, including CLYC, can be successfully employed for a dual gamma ray and neutron detection, which is possible with the help of pulse shape discrimination (PSD). PSD allows for recognition of an incident particle’s nature based on the shape of the corresponding scintillation pulse. CLYC has the potential to minimize the cost and complexity of dual sensing gamma ray and neutron spectrometers. We also address progress in growth of CLYC crystals with large diameters (1” and 2”) that are transparent and crack free.

Proceedings Article | 17 October 2012 Paper

Paper

The uniformity and imaging properties of some new ceramic scintillators

George T. Chac, Brian Miller, Kanai Shah, Gary Baldoni, Kenneth Domanik, Vaibhav Bora, Nerine Cherepy, Zachary Seeley, H. Bradford Barber

Proceedings Volume 8508, 85080H (2012) https://doi.org/10.1117/12.966670

KEYWORDS: Scintillators, Ceramics, Gamma radiation, Imaging spectroscopy, Imaging systems, Sensors, Spectroscopy, Spatial resolution, Image intensifiers, Crystals

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Proceedings Article | 28 September 2011 Paper

Paper

Performance of europium-doped strontium iodide, transparent ceramics and bismuth-loaded polymer scintillators

N. Cherepy, S. Payne, B. Sturm, S. O'Neal, Z. Seeley, O. Drury, L. K. Haselhorst, B. Rupert, R. Sanner, P. Thelin, S. Fisher, R. Hawrami, K. Shah, A. Burger, J. Ramey, L. Boatner

Proceedings Volume 8142, 81420W (2011) https://doi.org/10.1117/12.896656

KEYWORDS: Scintillators, Ceramics, Crystals, Strontium, Spectroscopy, Scintillation, Gamma radiation, Garnet, Bismuth, Radiography

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Proceedings Article | 28 September 2011 Paper

Paper

Physics of scintillator nonproportionality

S. Payne, S. Hunter, B. Sturm, N. Cherepy, L. Ahle, S. Sheets, S. Dazeley, W. Moses, G. Bizarri

Proceedings Volume 8142, 814210 (2011) https://doi.org/10.1117/12.895969

KEYWORDS: Ions, Oxides, Scintillators, Neodymium, Physics, Silicates, Excitons, Gadolinium, Crystals, Molybdenum

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Proceedings Article | 21 September 2010 Paper

Paper

Transparent ceramic scintillators for gamma spectroscopy and radiography

N. Cherepy, J. Kuntz, Z. Seeley, S. Fisher, O. Drury, B. Sturm, T. Hurst, R. Sanner, J. Roberts, S. Payne

Proceedings Volume 7805, 78050I (2010) https://doi.org/10.1117/12.862503

KEYWORDS: Ceramics, Scintillators, Garnet, Crystals, Radiography, Spectroscopy, Glasses, Gadolinium, Oxides, Gamma radiation

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Proceedings Article | 12 September 2009 Paper

Paper

Neutron detection with single crystal organic scintillators

Natalia Zaitseva, Jason Newby, Sebastien Hamel, Leslie Carman, Michelle Faust, Vincenzo Lordi, Nerine Cherepy, Wolfgang Stoeffl, Stephen Payne

Proceedings Volume 7449, 744911 (2009) https://doi.org/10.1117/12.829870

KEYWORDS: Crystals, Scintillators, Luminescence, Molecules, Crystallography, Organic materials, Scintillation, Liquids, Raw materials, Liquid crystals

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Proceedings Article | 12 September 2009 Paper

Paper

SrI[sub]2[/sub] scintillator for gamma ray spectroscopy

N. Cherepy, B. Sturm, O Drury, T. Hurst, S. Sheets, L. Ahle, C. Saw, M. Pearson, S. Payne, A. Burger, L. Boatner, J. Ramey, E. van Loef, J. Glodo, R. Hawrami, W. Higgins, K. Shah, W. Moses

Proceedings Volume 7449, 74490F (2009) https://doi.org/10.1117/12.830016

KEYWORDS: Crystals, Gamma radiation, Scintillators, Spectroscopy, Scintillation, Strontium, X-ray diffraction, Europium, Crystal optics, Single crystal X-ray diffraction

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Proceedings Article | 5 September 2008 Paper

Paper

Strontium iodide scintillators for high energy resolution gamma ray spectroscopy

Cody Wilson, Edgar van Loef, Jarek Glodo, Nerine Cherepy, Giulia Hull, Stephen Payne, Woon-Seng Choong, William Moses, Kanai Shah

Proceedings Volume 7079, 707917 (2008) https://doi.org/10.1117/12.806291

KEYWORDS: Crystals, Scintillation, Scintillators, Gamma radiation, Europium, Spectroscopy, Strontium, Polishing, Cerium, Patents

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Proceedings Article | 4 September 2008 Paper

Paper

SrI[sub]2[/sub]: a novel scintillator crystal for nuclear isotope identifiers

R. Hawrami, M. Groza, Y. Cui, A. Burger, M. Aggarwal, Nerine Cherepy, Stephen Payne

Proceedings Volume 7079, 70790Y (2008) https://doi.org/10.1117/12.798335

KEYWORDS: Crystals, Scintillators, Scintillation, Gamma radiation, Photography, Physics, Strontium, Calcium, Europium, Temperature metrology

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Proceedings Article | 4 September 2008 Paper

Paper

Transparent ceramic scintillator fabrication, properties, and applications

N. Cherepy, J. Kuntz, J. Roberts, T. Hurst, O. Drury, R. Sanner, T. Tillotson, S. Payne

Proceedings Volume 7079, 70790X (2008) https://doi.org/10.1117/12.797398

KEYWORDS: Ceramics, Garnet, Scintillators, Gadolinium, Radiography, Gamma radiation, Oxides, Transparency, Crystals, Scandium

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Proceedings Article | 24 September 2007 Paper

Paper

Ce-doped single crystal and ceramic garnet for gamma-ray detection

G. Hull, J. Roberts, J. Kuntz, S. Fisher, R. Sanner, T. Tillotson, A. Drobshoff, S. Payne, N. Cherepy

Proceedings Volume 6706, 670617 (2007) https://doi.org/10.1117/12.738961

KEYWORDS: Ceramics, Garnet, Crystals, Aluminum, Scintillators, Gamma radiation, Cerium, Lutetium, Gadolinium, Terbium

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Proceedings Article | 24 September 2007 Paper

Paper

Barium iodide single-crystal scintillator detectors

Nerine Cherepy, Giulia Hull, Thomas Niedermayr, Alexander Drobshoff, Stephen Payne, Utpal Roy, Yunlong Cui, Ajanta Bhattacharaya, Melissa Harrison, Mingsheng Guo, Michael Groza, Arnold Burger

Proceedings Volume 6706, 670616 (2007) https://doi.org/10.1117/12.738973

KEYWORDS: Crystals, Europium, Barium, Luminescence, Scintillators, Sensors, Scintillation, Cerium, Excitons, Gamma radiation

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Showing 5 of 55 publications

Proceedings Volume Editor (3)

SPIE Conference Volume | 25 October 2023

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXV

SPIE Conference Volume | 14 October 2022

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIV

SPIE Conference Volume | 16 September 2021

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII

Conference Committee Involvement (17)

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXVI

19 August 2024 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXV

21 August 2023 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIV

22 August 2022 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII

1 August 2021 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXII

25 August 2020 | Online Only, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI

12 August 2019 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XX

20 August 2018 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX

7 August 2017 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII

29 August 2016 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII

10 August 2015 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVI

18 August 2014 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XV

26 August 2013 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIV

13 August 2012 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII

22 August 2011 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII

2 August 2010 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI

3 August 2009 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics X

11 August 2008 | San Diego, California, United States

Showing 5 of 17 Conference Committees

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