In this study 2-dimensional plasma simulation code was used to find a new approach of x-ray detection method with
PDP-like geometry and condition. A conventional PDP geometry consisted of three electrodes was selected and Ne-Xe
composition gas was filled the cell-gap. Depending on incident X-ray energy, the number of charges generated within
the cell-gap could be different. For the charge amplification and collection of charges two consecutive ac pulses were
applied to scan and address electrodes. The increased charges were collected on the positive-bias address electrode at the
rear panel. Two parameters, such as amplitude of collected current and formation delay of collected current, were
calculated and compared. The formation delay showed more accurate relationship than the collected current amplitude.
Conventional gamma cameras which uses photomultiplier tubes(PMT) is very heavy, bulky, and
expensive. In addition, its spatial resolution is low because of geometrical limitation of PMTs. This
low resolution and large size is not efficient for the small animal imaging system which is useful in
preclinical imaging application. We have developed a small size but high spatial resolution gamma
ray detector, based on charge-coupled device(CCD) which is useful to develop a prototype model of
small animal gamma camera. Recently the sensitivity of CCD was improved and the peltier cooling
system helped to minimize the dark currents of CCD significantly. The enhanced sensitivity and
high intrinsic resolution of CCD enabled researchers to develop the small size gamma camera with
low cost. In this study we used peltier cooled CCD sensor which has about 70% of quantum
efficiency at 650nm wave length. CsI(Tl) scintillator was also used to convert the gamma ray to
visible lights. These light photons from the scintillator have been collected to the CCD surface by
Nikorr macro lens to enhance the collection efficiency. The experimental results showed that the
proposed CCD-based detection system is feasible for gamma ray detection.
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