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Development of a Coded-aperture Gamma Camera for Monitoring of Radioactive Materials  

Cho, Gye-Seong (Korea Advanced Institute nf Science and Technology)
Shin, Hyung-Joo (Korea Advanced Institute nf Science and Technology)
Chi, Yong-Ki (Korea Advanced Institute nf Science and Technology)
Yoon, Jeong-Hyoun (Nuclear Environment Technology Institute)
Publication Information
Journal of Radiation Protection and Research / v.29, no.4, 2004 , pp. 257-261 More about this Journal
Abstract
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.
Keywords
gamma camera; pin hole; coded-aperture; sensitivity; Signal-to-noise ratio;
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