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 (18)

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

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

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

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

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

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

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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: 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 | October 17, 2012

The uniformity and imaging properties of some new ceramic scintillators

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

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

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

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PROCEEDINGS ARTICLE | September 28, 2011

Physics of scintillator nonproportionality

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

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

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

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

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

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