Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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A Germanium Detector Structure PENEL OPE Characteristic Analysis by Computer Simulation

HPGe 검출기의 PENELOPE 전산모사에 의한 특성 분석

  • Jang, Eunsung (Pusan National University Nuclear Physics and Radiation Technology Research Center) ;
  • Jang, BoSeok (Department of Image Information Engineering, Pusan National University)
  • 장은성 (부산대학교 핵물리 및 방사선기술연구소) ;
  • 장보석 (부산대학교 공과대학 영상정보공학과)
  • Received : 2014.09.26
  • Accepted : 2015.02.25
  • Published : 2015.02.28
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Abstract

In order to observe the detailed structure of the detector, it was CT scanned to reproduce the detailed structure of the crystal shapes and traverse layer using the Monte Carlo calculation applying the detector model. The uncertainty of measurement was lowered by adjusting the detector core by the edge effect at a higher energy (400 keV or higher) through the offset of peak efficiency of the gamma ray at low energy. It was confirmed that there was the appropriate matching with spatial dependency using the PENELOPE calculation. That was achieved by adjusting the parameters describing the crystal core and rounding of edge and crystal core.

검출기의 자세한 구조를 알고자 CT 스캐닝을 하였으며 크리스털 형상과 사층에 관한 세부적인 구조를 전산모사 계산법을 이용해 재현하였다. 낮은 에너지의 감마선에 대한 피크 효율이 거리가 작아질수록 감소, 보다 높은 에너지(400 keV) 아상에서의 전체 효율성은 검출기 코어를 조정함으로써 불확도를 줄일 수 있었다. PENELOPE 계산법을 이용해 얻은 공간적 의존성 사이에 적절한 일치점이 달성되었음을 확인 하였다. 이는 크리스털 코어, 모서리와 크리스털 코어의 라운딩을 설명해 주는 매개변수들을 조정함으로써 달성되었다.

Keywords

References

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