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J Radiat Prot > Volume 29(4); 2004 > Article
Journal of Radiation Protection 2004;29(4):257-0.
방사성 물질 감시를 위한 부호화 구경 감마카메라 개발
Development of a Coded-aperture Gamma Camera for Monitoring of Radioactive Materials
Cho, Gye-Seong;Shin, Hyung-Joo;Chi, Yong-Ki;Yoon, Jeong-Hyoun;
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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