Dr. Nerine J. Cherepy Profile

Dr. Nerine J. Cherepy

Research Scientist, Chemical Div at Lawrence Livermore National Lab

SPIE Involvement:

Senior status | Conference Program Committee | Author

Area of Expertise:

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

Websites:

Company Website

Profile Summary

New scintillators based on transparent ceramics, plastics and halide crystals. Scintillator detector development for gamma spectroscopy, neutron and X-ray radiographic imaging.

Publications (25)

PROCEEDINGS ARTICLE | October 18, 2017

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

Proc. SPIE. 10392, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX

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

PROCEEDINGS ARTICLE | October 18, 2017

Recent advances in garnet scintillator gamma spectrometers (Conference Presentation)

Proc. SPIE. 10392, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX

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

PROCEEDINGS ARTICLE | September 29, 2017

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

Proc. SPIE. 10392, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX

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

PROCEEDINGS ARTICLE | September 15, 2017

History and current status of strontium iodide scintillators

Proc. SPIE. 10392, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX

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

PROCEEDINGS ARTICLE | November 2, 2016

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

Proc. SPIE. 9968, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII

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

PROCEEDINGS ARTICLE | November 2, 2016

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

Proc. SPIE. 9968, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII

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

PROCEEDINGS ARTICLE | November 2, 2016

Scintillation Characterization of Doped Cesium Hafnium Chloride (Conference Presentation)

Proc. SPIE. 9968, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII

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

PROCEEDINGS ARTICLE | November 2, 2016

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

Proc. SPIE. 9968, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII

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

PROCEEDINGS ARTICLE | September 4, 2015

Transparent ceramic scintillators for gamma spectroscopy and MeV imaging

Proc. SPIE. 9593, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII

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

PROCEEDINGS ARTICLE | September 9, 2014

Strontium iodide instrument development for gamma spectroscopy and radioisotope identification

Proc. SPIE. 9213, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVI

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

PROCEEDINGS ARTICLE | September 9, 2014

High energy resolution with transparent ceramic garnet scintillators

Proc. SPIE. 9213, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVI

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

PROCEEDINGS ARTICLE | September 5, 2014

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

Proc. SPIE. 9213, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVI

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

PROCEEDINGS ARTICLE | October 24, 2012

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

Proc. SPIE. 8507, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIV

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

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 | October 24, 2012

Transparent garnet ceramic scintillators for gamma-ray detection

Proc. SPIE. 8507, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIV

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

PROCEEDINGS ARTICLE | October 17, 2012

The uniformity and imaging properties of some new ceramic scintillators

Proc. SPIE. 8508, Medical Applications of Radiation Detectors II

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

PROCEEDINGS ARTICLE | September 28, 2011

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

Proc. SPIE. 8142, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII

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

PROCEEDINGS ARTICLE | September 28, 2011

Physics of scintillator nonproportionality

Proc. SPIE. 8142, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII

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

PROCEEDINGS ARTICLE | September 21, 2010

Transparent ceramic scintillators for gamma spectroscopy and radiography

Proc. SPIE. 7805, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII

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

PROCEEDINGS ARTICLE | September 12, 2009

Neutron detection with single crystal organic scintillators

Proc. SPIE. 7449, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI

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

PROCEEDINGS ARTICLE | September 12, 2009

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

Proc. SPIE. 7449, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI

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

PROCEEDINGS ARTICLE | September 5, 2008

Strontium iodide scintillators for high energy resolution gamma ray spectroscopy

Proc. SPIE. 7079, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics X

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

PROCEEDINGS ARTICLE | September 4, 2008

Transparent ceramic scintillator fabrication, properties, and applications

Proc. SPIE. 7079, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics X

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

PROCEEDINGS ARTICLE | September 4, 2008

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

Proc. SPIE. 7079, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics X

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

PROCEEDINGS ARTICLE | September 24, 2007

Barium iodide single-crystal scintillator detectors

Proc. SPIE. 6706, Hard X-Ray and Gamma-Ray Detector Physics IX

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

PROCEEDINGS ARTICLE | September 24, 2007

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

Proc. SPIE. 6706, Hard X-Ray and Gamma-Ray Detector Physics IX

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

Showing 5 of 25 publications

Conference Committee Involvement (11)

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

Showing 5 of 11 published special sections

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