Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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Fabrication of Bendable Gd2O2S:Tb Intensifying Screen and Evaluation of Fatigue Properties

유연한 Gd2O2S:Tb 증감지 제작 및 피로누적에 대한 영향

  • Park, Ji-Koon (Department of Radiological Science, International University of Korea) ;
  • Yang, Sung-Woo (Department of Radiological Science, International University of Korea) ;
  • Jeon, Je-Hoon (Department of Radiological Science, International University of Korea) ;
  • Kim, Joo-Hee (Department of Emergency and Disaster Management, Inje University) ;
  • Heo, Ye-Ji (Department of Biomedical Engineering, Inje University) ;
  • Kang, Sang-Sik (Department of Radiological Science, International University of Korea) ;
  • Kim, Kyo-Tae (Department of Biomedical Engineering, Inje University)
  • 박지군 (한국국제대학교 방사선학과) ;
  • 양승우 (한국국제대학교 방사선학과) ;
  • 전제훈 (한국국제대학교 방사선학과) ;
  • 김주희 (인제대학교 재난관리학과) ;
  • 허예지 (인제대학교 의용공학과) ;
  • 강상식 (한국국제대학교 방사선학과) ;
  • 김교태 (인제대학교 의용공학과)
  • Received : 2017.11.23
  • Accepted : 2017.12.31
  • Published : 2017.12.31
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Abstract

In this study, it was expected that long-term stability against external mechanical external force could be secured if the phosphor layer had ductility. In this study, a bendable $Gd_2O_2S:Tb$ sensitized paper was fabricated by screen printing method and the image uniformity was evaluated through RMS analysis and histogram analysis to investigate the effect of fatigue accumulation due to long-term external force and repetitive external force. As a result, the dominant pixel area is maintained constant and the relative standard deviation is less than 10% for the long-term external force. However, for the repetitive external force, the dominant pixel area is divided into three areas and the image uniformity is adversely affected. Based on these results, it is suggested that the curved surface detector can be applied by securing the mechanical stability against the existing radiation sensitized paper. However, further studies are needed to apply it to the flexible detector. As a result, flexible radiation sensitizers can be applied to various curved surfaces, and it is expected to be applicable to various fields such as nuclear medicine, medical treatment, and industrial fields in the future.

본 연구에서는 연성을 형광체 층이 가질 수 있다면 외부의 기계적 외력에 대하여 장기간 안정성을 확보할 수 있을 것으로 기대하였다. 이에 본 연구에서는 스크린 프린팅 공법을 통하여 유연한 $Gd_2O_2S:Tb$ 증감지를 제작하였고 장기적인 외력에 의한 피로누적과 반복적인 외력에 의한 피로누적에 따른 영향을 고찰하고자 RMS 분석과 히스토그램을 분석을 통하여 영상 균일도를 평가하였다. 연구 결과, 지속적인 외력에 대하여는 지배적인 픽셀 영역이 일정하게 유지되면서 RSD가 10% 이내를 만족하였으나, 반복적인 외력의 경우 지배적인 픽셀 영역이 3 영역으로 분할되며 영상 균일도에 악영향을 미치며 RSD가 10% 이상으로 증가하는 것으로 나타났다. 이러한 결과를 바탕으로 기존 방사선증감지에 대비하여 기계적 안정성을 확보함으로써 곡면 검출기의 적용 가능성을 제시하였으나 아직까지 플렉시블 검출기에 적용하기 위해서는 추가적인 연구가 필요할 것으로 사료된다. 이러한 결과 유연성을 가진 방사선 증감지는 다양한 곡면에 적용이 가능하므로 향후 핵의학, 치료용, 산업 분야 등과 같은 다양한 분야에 적용할 수 있을 것으로 기대된다.

Keywords

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