Transactions on Electrical and Electronic Materials

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Zinc Sulfide-selenium X-ray Detector for Digital Radiography

  • Park, Ji-Koon (Department of Biomedical Engineering, College of Biomedical Science and Engineering, Inje University) ;
  • Kang, Sang-Sik (Department of Biomedical Engineering, College of Biomedical Science and Engineering, Inje University) ;
  • Kim, Jae-Hyung (Medical imaging Research Center, Inje University) ;
  • Mun, Chi-Woong (Medical imaging Research Center, Inje University) ;
  • Nam, Sang-Hee (Medical imaging Research Center, Inje University)
  • Published : 2002.12.01
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Abstract

The high bias voltage associated with the thick layer (typically 500-1000 ㎛) of selenium required to have an acceptable x-ray absorption in radiography and fluoroscopy applications may have some practical inconvenience. A hybrid x-ray detector with zinc sulfide-amorphous selenium structure has been developed to improve the x-ray sensitivity of a a-Se based flat-panel digital imaging detector. Photoluminescence(PL) characteristic of a ZnS:Ag phosphor layer showed a light emission peak centered at about 450 nm, which matches the sensitivity spectrum of selenium. The dark current of the hybrid detector showed similar characteristics with that of a a-Se detector. The x-ray sensitivity of hybrid and a-Se x-ray detector was 345 pC/㎠/mR and 295 pC/㎠/mR at an applied voltage of 10 V/㎛, respectively. The purpose of this study was to evaluate the pertinence of a solution using a thin selenium layer, as a photosensitive converter, with a thick coating of silver doped zinc sulfide phosphor.

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