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http://dx.doi.org/10.1016/j.net.2021.01.036

Development and performance evaluation of large-area hybrid gamma imager (LAHGI)  

Lee, Hyun Su (Department of Nuclear Engineering, Hanyang University)
Kim, Jae Hyeon (Department of Nuclear Engineering, Hanyang University)
Lee, Junyoung (Department of Nuclear Engineering, Hanyang University)
Kim, Chan Hyeong (Department of Nuclear Engineering, Hanyang University)
Publication Information
Nuclear Engineering and Technology / v.53, no.8, 2021 , pp. 2640-2645 More about this Journal
Abstract
We report the development of a gamma-ray imaging device, named Large-Area Hybrid Gamma Imager (LAHGI), featuring high imaging sensitivity and good imaging resolution over a broad energy range. A hybrid collimation method, which combines mechanical and electronic collimation, is employed for a stable imaging performance based on large-area scintillation detectors for high imaging sensitivity. The system comprises two monolithic position-sensitive NaI(Tl) scintillation detectors with a crystal area of 27 × 27 cm2 and a tungsten coded aperture mask with a modified uniformly redundant array (MURA) pattern. The performance of the system was evaluated under several source conditions. The system showed good imaging resolution (i.e., 6.0-8.9° FWHM) for the entire energy range of 59.5-1330 keV considered in the present study. It also showed very high imaging sensitivity, successfully imaging a 253 µCi 137Cs source located 15 m away in 1 min; this performance is notable considering that the dose rate at the front surface of the system, due to the existence of the 137Cs source, was only 0.003 µSv/h, which corresponds to ~3% of the background level.
Keywords
Hybrid imaging; Compton imaging; Coded aperture imaging; Scintillation detector;
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