Development and performance evaluation of large-area hybrid gamma imager (LAHGI)
- Authors
- Lee, Hyun Su; Kim, Jae Hyeon; Lee, Junyoung; Kim, Chan Hyeong
- Issue Date
- Feb-2021
- Publisher
- Korean Nuclear Society
- Keywords
- Coded aperture imaging; Compton imaging; Hybrid imaging; Scintillation detector
- Citation
- Nuclear Engineering and Technology, v.53, no.8, pp.2640 - 2645
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- Nuclear Engineering and Technology
- Volume
- 53
- Number
- 8
- Start Page
- 2640
- End Page
- 2645
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/8023
- DOI
- 10.1016/j.net.2021.01.036
- ISSN
- 1738-5733
- 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.
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