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4 August 2021 Pixelated dual module GYGAG directional gamma spectrometer
Erik L. Swanberg, Sean P. O'Neal, Nerine J. Cherepy, Zachary M. Seeley, Stephen A. Payne, Joel Kindem
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Proceedings Volume 11838, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII; 1183809 (2021) https://doi.org/10.1117/12.2596159
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States
Abstract
We report on a small gamma spectrometer with directional detection, based on two modules. Each module contains an array of 128 scintillator pixels coupled to reverse-biased photodiodes, an ASIC and a microcontroller. Modules communicate via USB and are operated via an Android GUI on a WiFi-connected device. Transparent ceramic GYGAG ((Gd,Y,Ce)3(Ga,Al)5O12) garnet scintillator pixels offer energy resolution as good as 3.1% at 662 keV for individual pixels. We previously reported on an eight-module planar spectrometer, based on the same technology1. The current compact system uses two modules in a back-to-back configuration to improve its speed and accuracy in locating a gamma-emitting source in a 4-pi field of view. This dual module system (~2.5 x 2.5 x 3.5 inches) is suitable as a pager-sized RIID or spectroscopic personal radiation detector (SPRD). Multiple dual module units can be combined for improved efficiency. Spectroscopic and directional performance will be described.
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Erik L. Swanberg, Sean P. O'Neal, Nerine J. Cherepy, Zachary M. Seeley, Stephen A. Payne, and Joel Kindem "Pixelated dual module GYGAG directional gamma spectrometer", Proc. SPIE 11838, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII, 1183809 (4 August 2021); https://doi.org/10.1117/12.2596159
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KEYWORDS
Spectroscopy
Scintillators
Ceramics
Garnet
Image resolution
Microcontrollers
Photodiodes
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