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Simulated Performance of a Second-Generation Compact Compton Imaging Detector

Description: Simulations are performed using GEANT4 of a second-generation compact Compton imaging detector called CCI2 which uses silicon and germanium detector crystals. Realistic simulated detector geometry and realistic detector parameters are used. Results are obtained for the CCI2 detector for the intrinsic photopeak efficiency, imaging efficiency, and angular resolution, and simulated images are created for point sources with various energies and source angles.
Date: January 16, 2007
Creator: Manini, H A
Partner: UNT Libraries Government Documents Department

Simulation and Comparison of Various Gamma-Ray Imaging Detector Configurations for IPRL Devices

Description: Simulations are performed for seven different geometrical configurations of CdZnTe (CZT) detector arrays for Intelligent Personal Radiation Locator (IPRL) devices. IPRL devices are portable radiation detectors that have gamma-ray imaging capability. The detector performance is analyzed for each type of IPRL configuration, and the intrinsic photopeak efficiency, intrinsic photopeak count rate, detector image resolution, imaging efficiency, and imaging count rate are determined.
Date: December 27, 2006
Creator: Manini, H A
Partner: UNT Libraries Government Documents Department

CCI1 and CCI2 Detector Simulations and Figure-of-Merit Study

Description: We simulate the CCI1 and CCI2 detectors, using GEANT4, to study the figure of merit (FOM) for each detector. For both CCI1 and CCI2, we study how the FOM depends on strip pitch, z resolution, and lever-cut distance. For CCI2, we study how the FOM depends on the separation distance between the two silicon detectors, and the separation distance between the two germanium detectors. We also simulate future large-scale detector systems and calculate their FOM.
Date: August 31, 2005
Creator: Lange, D; Manini, H & Wright, D
Partner: UNT Libraries Government Documents Department

Large-Scale Compton Imaging for Wide-Area Surveillance

Description: We study the performance of a large-scale Compton imaging detector placed in a low-flying aircraft, used to search wide areas for rad/nuc threat sources. In this paper we investigate the performance potential of equipping aerial platforms with gamma-ray detectors that have photon sensitivity up to a few MeV. We simulate the detector performance, and present receiver operating characteristics (ROC) curves for a benchmark scenario using a {sup 137}Cs source. The analysis uses a realistic environmental background energy spectrum and includes air attenuation.
Date: March 1, 2006
Creator: Lange, D J; Manini, H A & Wright, D M
Partner: UNT Libraries Government Documents Department

Simulation and Analysis of Large-Scale Compton Imaging Detectors

Description: We perform simulations of two types of large-scale Compton imaging detectors. The first type uses silicon and germanium detector crystals, and the second type uses silicon and CdZnTe (CZT) detector crystals. The simulations use realistic detector geometry and parameters. We analyze the performance of each type of detector, and we present results using receiver operating characteristics (ROC) curves.
Date: December 27, 2006
Creator: Manini, H A; Lange, D J & Wright, D M
Partner: UNT Libraries Government Documents Department

Imaging Performance of the Si/Ge Hybrid Compton Imager

Description: The point spread function (PSF) of a fully-instrumented silicon/germanium Compton telescope has been measured as a function of energy and angle. Overall, the resolution ranged from 3{sup o} to 4{sup o} FWHM over most of the energy range and field of view. The various contributions to the resolution have been quantified. These contributions include the energy uncertainty and position uncertainty of the detector; source energy; Doppler broadening; and the 1/r broadening characteristic of Compton back-projection. Furthermore, a distortion of the PSF is observed for sources imaged off-axis from the detector. These contributions are discussed and compared to theory and simulations.
Date: November 10, 2005
Creator: Burks, M; Chivers, D; Cork, C; Cunningham, M; Fabris, L; Gunter, D et al.
Partner: UNT Libraries Government Documents Department