DocumentCode :
3511685
Title :
Optimization of high energy X-ray detector based on SNR in cargo container inspection system
Author :
Kwak, Sung-Woo ; Cho, Gyuseong ; Kim, Jin Sung
Author_Institution :
KAIST, Daejon, South Korea
Volume :
2
fYear :
2004
fDate :
16-22 Oct. 2004
Firstpage :
879
Abstract :
Energetic X-rays are used for nonintrusive inspection of large cargo containers at seaports or airports, nondestructive inspection of machine engines or pipes in industry, and quantification of free water in radioactive waste drums in nuclear industry. Such inspection systems have employed a photodiode-based solid state detector consisting of a single crystal and a photo sensor. In X-ray inspection systems using low energy X-ray known well, there is no interrelation between the increase in the crystal thickness for improving signal amplitude and the expansion of an active area of a photodiode. On the other hand, due to different detector arrangement, the increase of detector depth for improving signal in imaging system using high energy X-ray gives rise to the increase of signal as well as noise. In addition, the noise in a large detector has a significant effect on detector SNR. However, no studies on how to design a high energy X-ray detector in consideration of electronic noise in detector system have reported in the literature. To address this problem, new generalized design model using SNR (signal-to-noise ratio) of X-ray detector is proposed in this paper. The design model of this paper is also applied to realize the actual X-ray detector for 0.45 MeV cargo container inspection system and the test results obtained by the inspection system are discussed.
Keywords :
X-ray apparatus; X-ray detection; X-ray imaging; electron device noise; photodiodes; semiconductor counters; 0.45 MeV; X-ray inspection systems; active area; airport cargo containers; cargo container inspection system; crystal thickness; detector arrangement; detector depth; electronic noise; energetic X-rays; free water quantification; high energy X-ray detector; imaging system; industrial pipes; low energy X-ray; machine engines; nondestructive inspection; nonintrusive inspection; nuclear industry; photodiode-based solid state detector; photosensor; radioactive waste drums; seaport cargo containers; signal amplitude; signal-noise ratio; single crystal; Airports; Containers; Engines; Inspection; Radioactive waste; Signal to noise ratio; Solid state circuits; X-ray detection; X-ray detectors; X-ray imaging;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium Conference Record, 2004 IEEE
ISSN :
1082-3654
Print_ISBN :
0-7803-8700-7
Electronic_ISBN :
1082-3654
Type :
conf
DOI :
10.1109/NSSMIC.2004.1462348
Filename :
1462348
Link To Document :
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