Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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Study on Talbot Pattern for Grating Interferometer

격자간섭계를 위한 탈봇 패턴 연구

  • Kim, Youngju (School of Mechanical Engineering, Pusan National University) ;
  • Oh, Ohsung (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Jongyul (Neutron Instrument Division, Korea Atomic Energy Reserch Institute) ;
  • Lee, Seung Wook (School of Mechanical Engineering, Pusan National University)
  • 김영주 (부산대학교 기계공학부) ;
  • 오오성 (부산대학교 기계공학부) ;
  • 김종열 (한국원자력연구원 중성자장치개발관리부) ;
  • 이승욱 (부산대학교 기계공학부)
  • Received : 2015.01.31
  • Accepted : 2015.03.24
  • Published : 2015.03.31
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Abstract

One of properties which X-ray and Neutron can be applied nondestructive test is penetration into the object with interaction leads to decrease in intensity. X-ray interaction with the matter caused by electrons, Neutron caused by atoms. They share applications in nondestructive test area because of their similarities of interaction mechanism. Grating interferometer is the one of applications produces phase contrast image and dark field image. It is defined by Talbot interferometer and Talbot-Lau interferometer according to Talbot effect and Talbot-Lau effect respectively. Talbot interferometer works with coherence beam like X-ray, and Talbot-Lau has an effect with incoherence beam like Neutron. It is important to expect the interference in grating interferometer compared normal nondestructive system. In this paper, simulation works are conducted according to Talbot and Talbot-Lau interferometer in case of X-ray and Neutron. Variation of interference intensity with X-ray and Neutron based on wave theory is constructed and calculate elements consist the system. Additionally, Talbot and Talbot-Lau interferometer is simulated in different kinds of conditions.

격자 간섭계(grating interferometer)는 방사선 영상분야의 새로운 기술로서, 흡수 영상(absorption imaging)뿐만 아니라 위상차 영상(phase contrast imaging)과 다크필드 영상(dark field imaging)을 제공한다. 격자 간섭계는 크게 탈봇 효과(talbot effect)를 이용하는 탈봇 간섭계와 탈봇-라우 효과(talbot-lau effect)를 이용하는 탈봇-라우 간섭계로 나뉘는데, 일반적인 방사선 영상시스템과 달리 방사선의 간섭을 예측하고 적용하는 것이 중요하다. 본 연구에서는 현재 부산대학교 중성자 및 방사선 공학 연구실에서 보유하고 있는 엑스선 격자 세트와 중성자 격자 세트를 이용하여 탈봇 간섭 패턴 및 탈봇-라우 간섭 패턴을 제작하였다. 이를 통해 방사선의 파동 거동에 따른 간섭 세기의 변화를 예측하고, 격자 간섭계를 구성하는 각 요소들을 계산했다. 그리고 격자의 종류 및 위상차 물체에 대한 탈봇 간섭 패턴 및 탈봇-라우 간섭 패턴을 예측하였다.

Keywords

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