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KMID : 0364920120370030016
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Journal of Radiation Protection and Research
2012 Volume.37 No. 3 p.16 ~ p.24
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Development of Signal Processing Circuit for Side-absorber of Dual-mode Compton Camera
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Seo Hee
Park Jin-Hyung
Park Jong-Hoon
Kim Young-Su
Kim Chan-Hyeong
Lee Ju-Hahn
Lee Chun-Sik
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Abstract
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In the present study, a gamma-ray detector and associated signal processing circuit was developed for a side-absorber of a dual-mode Compton camera. The gamma-ray detector was made by optically coupling a CsI(Tl) scintillation crystal to a silicon photodiode. The developed signal processing circuit consists of two parts, i.e., the slow part for energy measurement and the fast part for timing measurement. In the fast part, there are three components: (1) fast shaper, (2) leading-edge discriminator, and (3) TTL-to-NIM logic converter. AC coupling configuration between the detector and front-end electronics (FEE) was used. Because the noise properties of FEE can significantly affect the overall performance of the detection system, some design criteria were presented. The performance of the developed system was evaluated in terms of energy and timing resolutions. The evaluated energy resolution was 12.0% and 15.6% FWHM for 662 and 511 keV peaks, respectively. The evaluated timing resolution was 59.0 ns. In the conclusion, the methods to improve the performance were discussed because the developed gamma-ray detection system showed the performance that could be applicable but not satisfactory in Compton camera application.
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KEYWORD
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Compton Camera, Dual-mode, Scintillation Detector, Silicon Photodiode, Signal Processing Circuit
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