G. S. Camarda
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View article: WoRDMAp Outbrief: Workshop on Radiation Detection Materials [Slides]
WoRDMAp Outbrief: Workshop on Radiation Detection Materials [Slides] Open
Project Goal: Identify pathway to reliably grow and fabricate high-performance radiation detectors for use in a variety of nonproliferation applications. 1. Create 3 working groups (semiconductors, inorganic and organic scintillators) that…
View article: Production and distribution of dilute species in semiconducting materials
Production and distribution of dilute species in semiconducting materials Open
Technologies are described effective to implement systems and methods of producing a material. The methods comprise receiving a tertiary semiconductor sample with a dilute species. The sample has two ends. The first end of the sample inclu…
View article: Array of virtual Frisch-grid detectors with common cathode and reduced length of shielding electrodes
Array of virtual Frisch-grid detectors with common cathode and reduced length of shielding electrodes Open
A radiation detector system that solves the electron trapping problem by optimizing shielding of the individual virtual Frisch-grid detectors in an array configuration with a common cathode.
View article: Radiation detector device for rejecting and excluding incomplete charge collection events
Radiation detector device for rejecting and excluding incomplete charge collection events Open
A radiation detector device is provided that is capable of distinguishing between full charge collection (FCC) events and incomplete charge collection (ICC) events based upon a correlation value comparison algorithm that compares correlati…
View article: Performance Study of Virtual Frisch Grid CdZnTeSe Detectors
Performance Study of Virtual Frisch Grid CdZnTeSe Detectors Open
Nuclear detectors for x-ray and gamma-ray spectroscopy and imaging are a vital tool in many homeland security, medical imaging, astrophysics and other applications. Most of these applications require room-temperature operation due to the o…
View article: Evaluation of crystalline quality of traveling heater method (THM) grown Cd0.9Zn0.1Te0.98Se0.02 crystals
Evaluation of crystalline quality of traveling heater method (THM) grown Cd0.9Zn0.1Te0.98Se0.02 crystals Open
Because of its excellent opto-electronic properties, CdZnTe (CZT) has been the material of choice for x- and gamma-ray detectors operable at room temperature. CZT is the leading commercially available room-temperature radiation detector ma…
View article: Advances in CdZnTeSe for Radiation Detector Applications
Advances in CdZnTeSe for Radiation Detector Applications Open
Detection of X- and gamma-rays is essential to a wide range of applications from medical imaging to high energy physics, astronomy, and homeland security. Cadmium zinc telluride (CZT) is the most widely used material for room-temperature d…
View article: Optimization of selenium in CdZnTeSe quaternary compound for radiation detector applications
Optimization of selenium in CdZnTeSe quaternary compound for radiation detector applications Open
X- and gamma-ray detectors are increasingly becoming an essential tool for science and technology in various fields, including homeland security, nonproliferation, nuclear security, medical imaging, astrophysics, and high energy physics. C…
View article: Characterization of large-volume Frisch grid detector fabricated from as-grown CdZnTeSe
Characterization of large-volume Frisch grid detector fabricated from as-grown CdZnTeSe Open
CdZnTe (CZT) has been under continuous development as a room-temperature radiation detector for the past 2–3 decades. Due to its intrinsic defects, such as a high concentration subgrain boundary network, it has been very challenging to con…
View article: High-resolution virtual Frisch grid gamma-ray detectors based on as-grown CdZnTeSe with reduced defects
High-resolution virtual Frisch grid gamma-ray detectors based on as-grown CdZnTeSe with reduced defects Open
X- and gamma-ray detectors are increasingly becoming essential tools for science and technology in various fields. These detectors offer broad applications such as homeland security, nonproliferation, nuclear security, medical imaging, ast…
View article: Charge-transport properties of as-grown Cd<sub>1-x</sub>Zn<sub>x</sub>Te<sub>1-y</sub>Se<sub>y</sub> by the traveling heater method
Charge-transport properties of as-grown Cd<sub>1-x</sub>Zn<sub>x</sub>Te<sub>1-y</sub>Se<sub>y</sub> by the traveling heater method Open
In this article, we report on the charge-transport characteristics of a new quaternary material Cd1-xZnxTe1-ySey (CZTS) grown by the Traveling Heater Method (THM). The as-grown CZTS material was found to possess fewer Te inclusions than CZ…
View article: Growth and characterization of detector-grade CdMnTe by the vertical Bridgman technique
Growth and characterization of detector-grade CdMnTe by the vertical Bridgman technique Open
We grew Cd1-xMnxTe crystals with a nominal Mn concentration of 5% by the vertical Bridgman growth technique. The compositional variation along the length of the grown ingot was studied by powder X-ray diffraction. The composition was found…
View article: Cs2LiCeCl6: An intrinsic scintillator for dual gamma and neutron detector applications (Conference Presentation)
Cs2LiCeCl6: An intrinsic scintillator for dual gamma and neutron detector applications (Conference Presentation) Open
Intrinsic materials can offer advantages over doped materials for some important applications. The doped material might suffer from non-uniform distribution of the dopant, such as fine-scale striations and larger scale segregation, which m…
View article: Crystal growth of CdZnTeSe (CZTS) gamma detectors: a promising alternative to CdZnTe (Conference Presentation)
Crystal growth of CdZnTeSe (CZTS) gamma detectors: a promising alternative to CdZnTe (Conference Presentation) Open
Alloying of CdZnTe (CZT) with selenium has been found to be very promising and effective in reducing the overall concentration of secondary phases (Te precipitates/inclusions) and sub-grain boundary networks in the crystals. These two type…
View article: Assessment of a new ZnO:Al contact to CdZnTe for X- and gamma-ray detector applications
Assessment of a new ZnO:Al contact to CdZnTe for X- and gamma-ray detector applications Open
The large mismatch of the coefficients of thermal expansion (CTE) between the metal contact and CdZnTe exerts thermal stress at the metal/CZT interface, which causes mechanical degradation of the contact in addition to the poor adhesion of…
View article: Arrays of Position-Sensitive Virtual Frisch-Grid CdZnTe Detectors: Results From a $4\times 4$ Array Prototype
Arrays of Position-Sensitive Virtual Frisch-Grid CdZnTe Detectors: Results From a $4\times 4$ Array Prototype Open
Position-sensitive virtual Frisch-grid (VFG) CdZnTe (CZT) detectors offer a unique capability for correcting the response nonuniformities caused by crystal defects. This allowed us to achieve high energy resolution, while using typical-gra…
View article: A comparison of point defects in Cd1−xZnxTe1−ySey crystals grown by Bridgman and traveling heater methods
A comparison of point defects in Cd1−xZnxTe1−ySey crystals grown by Bridgman and traveling heater methods Open
In this paper, the properties of point defects in Cd1−xZnxTe1−ySey (CZTS) radiation detectors are characterized using deep-level transient spectroscopy and compared between materials grown using two different methods, the Bridgman method a…
View article: BNLs Synchrotron-radiation Research Hub for Characterizing Detection Materials and Devices for the NA-22 Community
BNLs Synchrotron-radiation Research Hub for Characterizing Detection Materials and Devices for the NA-22 Community Open
The goal of this project is to obtain and characterize scintillators, emerging- and commercial-compoundsemiconductor radiation- detection materials and devices provided by vendors and research organizations. The focus of our proposed resea…