Development of a Multi-Channel Signal Optimizer for a Compton Camera System

다국어 초록 (Multilingual Abstract)

A multi-channel differential-to-single-ended signal optimizer has been developed for application in a low-energy Compton camera system. The developed multi-channel signal optimizer enhanced the signal-to-noise ratio of the whole system compared to the case in which a simple resistive network converter was used. In order to verify the performance of the developed signal optimizer, we performed an energy measurement for gamma rays emitted from 241Am, 133Ba and 137Cs standard sources by using a double-sided silicon strip detector. The energy resolution of 19 keV, full width at half maximum, was obtained by fitting a 59.6-keV gamma-ray peak, and the energy threshold level of time pick-up circuits was determined to be 35 keV by comparing the measured energy spectrum with a simulated one obtained with a Monte Carlo code. The obtained energy resolution and the energy threshold level show that the developed signal optimizer can effectively enhance the signal-to-noise ratio for multi-channel electronics and enables us to construct a Compton camera system combined with low-cost commercially-available multi-channel electronics.

참고문헌 (Reference)

1 R. W. Todd, 251 : 132-, 1974

2 M. Singh, 10 : 421-, 1983

3 T. C onka Nurdan, 523 : 435-, 2004

4 J. H. Lee, 758 : 150-, 2005

5 J. H. Lee, 746 : 639-, 2004

6 D. Meier, 49 : 812-, 2002

7 S. H. Ahn, 571 : 251-, 2007

8 N. Y. Kim, 47 : 737-, 2005

9 이춘식, "Stack형 컴프턴 카메라의 영상특성에 대한 몬테카를로 모사연구" 한국물리학회 53 (53): 130-126, 2006

10 H. Y. Cho, "Pulse Shape Analysis of Induced Charges in a Segmented Germanium Detector by Using the Weighting Potential Method" 한국물리학회 45 (45): 1485-1489, 2004

11 Ju Hahn Lee, "Monte Carlo Study on the Imaging Resolution and Sensitivity of a Compton Camera" 한국물리학회 49 (49): 97-102, 2006