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4 October 2024 Performance characterization of 5x5x12 mm3 virtual Frisch-Grid TlBr detectors
Aleksey E. Bolotnikov, Conner Brown, Gabriella Carini, James Christian, Leonard Cirignano, Connie-Rose Deane, Alfred Dellapenna, Jack Fried, Sven Herrmann, Alireza Kargar, Hadong Kim, Michael Koslowsky, Piotr Maj, Vamshi Manthena, Alexander Miller, Sandeep Miryala, Andrea Norris, Yaroslav Ogorodnik, Giovanni Pinaroli, Eric Raguzin, Martin Smith, Mike Squillante, Mike R. Squillante, Joshua Tower, Andrew Valente, Evan Weststrate, Kanai Shah
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Proceedings Volume PC13151, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXVI; PC131510D (2024) https://doi.org/10.1117/12.3029913
Event: Optical Engineering + Applications, 2024, San Diego, California, United States
Abstract
We present the results from testing over 100 5x5x12 mm3 TlBr detectors configured as 3D position-sensitive virtual Frisch-grid (VFG) detectors with platinum contacts. The primary objective was to comprehensively understand factors limiting performance and long-term response variations in these detectors. The incorporation of 3D position sensitivity allowed us to monitor internal changes in charge collection efficiency after applying voltage, and to correlate them with device performance changes. The biased detectors underwent defect distribution alterations due to electric field-enhanced ion migration. Our results are based on an extensive dataset obtained from TlBr crystals produced by Radiation Monitoring Devices (RMD). These measurements were part of our development of a handheld isotope identifier based on an array of position-sensitive TlBr detectors, supported by the Department of Homeland Security, Countering Weapons of Mass Destruction Office. The majority of the detectors exhibited a common trend of performance improvement within 1-2 weeks, stabilization for some period of time, then a slow degradation; however, some detectors deviated from this pattern.
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Aleksey E. Bolotnikov, Conner Brown, Gabriella Carini, James Christian, Leonard Cirignano, Connie-Rose Deane, Alfred Dellapenna, Jack Fried, Sven Herrmann, Alireza Kargar, Hadong Kim, Michael Koslowsky, Piotr Maj, Vamshi Manthena, Alexander Miller, Sandeep Miryala, Andrea Norris, Yaroslav Ogorodnik, Giovanni Pinaroli, Eric Raguzin, Martin Smith, Mike Squillante, Mike R. Squillante, Joshua Tower, Andrew Valente, Evan Weststrate, and Kanai Shah "Performance characterization of 5x5x12 mm3 virtual Frisch-Grid TlBr detectors", Proc. SPIE PC13151, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXVI, PC131510D (4 October 2024); https://doi.org/10.1117/12.3029913
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KEYWORDS
Sensors
Homeland security
Weapons of mass destruction
Defect detection
Detector arrays
Electric field sensors
Ions
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