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KMID : 0364920040290040257
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Journal of Radiation Protection and Research
2004 Volume.29 No. 4 p.257 ~ p.261
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Development of a Coded-aperture Gamma Camera for Monitoring of Radioactive Mate
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Jo Kyu-Sung
Shin Hyung-Joo
Jee Yong-Ki
Yoon Jung-Hyun
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Abstract
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A coded-aperture gamma camera was developed to increase the sensitivity of a pin hole camera made with a pixellated CsI(Tl) scintillator and a position-sensitive photomultiplier tube. The modified round-hole uniformly redundant array of pixel size 13{\times}11 was chosen as a coded mask considering the detector spatial resolution. The performance of the coded-aperture camera was compared with the pin hole camera using various forms of Tc-99m source to see the improvement of signal-to-noise ratio or the improvement of the sensitivity. The image quality is much improved despite of a slight degradation of the spatial resolution. Though the camera and the test were made for low energy case, but the concept of the coded-aperture gamma camera could be effectively used for the radioactive environmental monitoring and other applications.
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KEYWORD
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gamma camera, pin hole, coded-aperture, sensitivity, Signal-to-noise ratio
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