Performance Evaluation of Component Detectors of Double-scattering Compton Camera

이중 산란형 컴프턴 카메라 구성 검출기 성능 평가

  • Seo, Hee (Department of Nuclear Engineering, Hanyang University) ;
  • Park, Jin-Hyung (Department of Nuclear Engineering, Hanyang University) ;
  • Kim, Chan-Hyeong (Department of Nuclear Engineering, Hanyang University) ;
  • Lee, Ju-Hahn (Department of Physics, Chung-Ang University) ;
  • Lee, Chun-Sik (Department of Physics, Chung-Ang University) ;
  • Lee, Jae-Sung (Department of Nuclear Medicine and Interdisciplinary Program in Radiation Applied Life Science, Seoul National University)
  • 서희 (한양대학교 원자력공학과) ;
  • 박진형 (한양대학교 원자력공학과) ;
  • 김찬형 (한양대학교 원자력공학과) ;
  • 이주한 (중앙대학교 물리학과) ;
  • 이춘식 (중앙대학교 물리학과) ;
  • 이재성 (서울대학교 핵의학교실)
  • Received : 2010.03.26
  • Accepted : 2010.05.03
  • Published : 2010.06.30

Abstract

Prototype double-scattering Compton camera, which consists of three gamma-ray detectors, that is, two double-sided silicon strip detectors (DSSDs) as scatterer detectors and a NaI(Tl) scintillation detector as an absorber detector, could provide high imaging resolution with a compact system. In the present study, the energy resolution and the timing resolution of component detectors were measured, and the parameters affecting the energy resolution of the DSSD were examined in terms of equivalent noise charge (ENC). The energy resolutions of the DSSD-1 and DSSD-2 were, in average, $25.2keV{\pm}0.8keV$ FWHM and $31.8keV{\pm}4.6keV$ FWHM at the 59.5 keV peak of $^{241}Am$, respectively. The timing resolutions of the DSSD and NaI(Tl) scintillation detector were 57.25 ns FWHM and 7.98 ns FWHM, respectively. In addition, the Compton image was obtained for a point-like $^{137}Cs$ gamma source with double-scattering Compton camera. From the present experiment, the imaging resolution of 8.4 mm FWHM (angular resolution of $8.1^{\circ}$ FWHM), and the imaging sensitivity of $1.5{\times}10^{-7}$ (intrinsic efficiency of $1.9{\times}10^{-6}$) were obtained.

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