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Charge Diffusion and Repulsion in Semiconductor Detectors.
Sensors (Basel)
November 2024
Department of Computer Sciences, Northwestern University, Evanston, IL 60208, USA.
Article Synopsis
- Semiconductor detectors for high-energy sensing are essential in various fields, including astronomy and medical imaging, and require precise characterization for optimal performance.
- Current simulation methods mainly focus on charge dynamics after photon absorption but often ignore factors like charge diffusion and Coulomb repulsion that affect detector behavior.
- This study evaluates existing simulation methods and introduces a new Monte Carlo technique that balances accuracy with computational efficiency, improving performance predictions for these detectors.
Learning-based physical models of room-temperature semiconductor detectors with reduced data.
Sci Rep
January 2023
Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA.
Room-temperature semiconductor radiation detectors (RTSD) have broad applications in medical imaging, homeland security, astrophysics and others. RTSDs such as CdZnTe, CdTe are often pixelated, and characterization of these detectors at micron level can benefit 3-D event reconstruction at sub-pixel level. Material defects alongwith electron and hole charge transport properties need to be characterized which requires several experimental setups and is labor intensive.
View Article and Find Full Text PDFDevelopment of a direction-sensitive gamma-ray monitoring system using a gamma camera with a dual-sided collimator: A Monte Carlo study.
Appl Radiat Isot
December 2021
Department of Integrative Medicine, Major in Digital Healthcare, Yonsei University College of Medicine, Seoul, Republic of Korea. Electronic address:
Nuclear explosions, sabotage, and dirty bomb materials are considered a security threat. This paper discusses the development of a gamma-ray monitoring system that enables the screening of nuclear materials moving simultaneously on both sides of the system at ports. This direction-sensitive gamma-ray monitoring (DSGM) system consists of a monolithic plastic scintillator surrounded by 28 photomultiplier tubes and dual-sided parallel-hole lead collimators.
View Article and Find Full Text PDFInterfacing an ion mobility spectrometry based explosive trace detector to a triple quadrupole mass spectrometer.
Anal Chem
November 2011
US Department of Homeland Security, Science & Technology Directorate, Transportation Security Laboratory, Atlantic City International Airport, New Jersey 08405, United States.
Hardware from a commercial-off-the-shelf (COTS) ion mobility spectrometry (IMS) based explosive trace detector (ETD) has been interfaced to an AB/SCIEX API 2000 triple quadrupole mass spectrometer. To interface the COTS IMS based ETD to the API 2000, the faraday plate of the IMS instrument and the curtain plate of the mass spectrometer were removed from their respective systems and replaced by a custom faraday plate, which was fabricated with a hole for passing the ion beam to the mass spectrometer, and a custom interface flange, which was designed to attach the IMS instrument onto the mass spectrometer. Additionally, the mass spectrometer was modified to increase the electric field strength and decrease the pressure in the differentially pumped interface, causing a decrease in the effect of collisional focusing and permitting a mobility spectrum to be measured using the mass spectrometer.
View Article and Find Full Text PDFA hole in the homeland defense. Fixated on smallpox, U.S. is unprepared for a more likely terror threat.
Mod Healthc
April 2003
Department of Emergency Medicine, Emory University School of Medicine, Atlanta, USA.
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