Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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Experiment for Clinical Application with Photodiode

Photodiode를 사용한 측정기의 임상응용을 위한 실험

  • Kim, You-Hyun (Dept. of Radiologic Technology, Junior college of Allied Health Sciences, Korea University) ;
  • Kwon, Soo-Il (Dept. of Physics, Kyonggi University) ;
  • Huh, Joon (Institute of Radiological Technokogy, Dong-A X-ray Co., L.T.D.)
  • 김유현 (고려대학교 보건전문대학 방사선과) ;
  • 권수일 (경기대학교 대학원 물리학과) ;
  • 허준 (동아방사선기술연구소)
  • Published : 1996.12.20
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Abstract

Studies were conducted to determine the clinical application of photodiode. We compared photodiode with ion-chamber as to change of tube potential, tube current, mAs and measured decreasing rate of penetration dose. When tube potential was changed from 60 kVp to 120 kVp, output of photodiode and ion-chamber were changed from 0.4 to 1.625, and 1.018 to 4.268, respectively. This was a good agreement to theory that $I=Kv^2it$(I is intensity, K is constant, v is tube potential, i is tube current, t is time). Characteristics for change of tube current and mAs were also a good agreement to theory. And comparison in decreasing rate of penetration dose was similar except above 6 cm in depth. Our results indicated that photodiode was a good instrument for relative measurement of radiation exposure, but we can not use the photodiode for absolute radiation dose.

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