Measurement of Absorbed Dose at the Tissue Surface from a Plain $^{90}Sr+^{90}Y$ Beta Sources

조직 표면에서의 베타선 흡수선량 측정

  • Hah, Suck-Ho (Korea Research Institute of Standard and Science, Rdia. Lab.) ;
  • Kim, Jeong-Mook (Korea atomic Energy Research Institute, Neclear Environment Management Center) ;
  • Yook, Chong-Chul (Department of Nuclear Engineering, Hanyang University)
  • 하석호 (한국표준과학연구원 방사선연구실) ;
  • 김정묵 (한국원자력연구소 원자력환경관리센터) ;
  • 육종철 (한양대학교 원자력공학과)
  • Published : 1991.12.30

Abstract

Beta ray $(^{90}Sr+^{90}Y)$ absorbed dose at tissue surface was measured from the distance of 30cm by use of extrapolation chamber. In the measurement, following factors were considered: effective area of collecting electrode, polarity effect, ion recombination and window attenuation. The measured absorbed dose rate at tissue surface was $1.493{\mu}Gy/sec$ with ${\pm}2.9%$.

외삽형 전리함을 사용하여 $^{90}Sr+^{90}Y(1.65mCi)$ 베타선원에 대해 교정점 30cm 거리에서 조직표면의 흡수선량을 측정하였다. 이때 흡수선량 측정에 영향을 주는 유효단면적, 입사창 감쇠율, 극성효과, 이온 재결합을 등의 보정인자를 분석하였다. 이들 인자를 보정한 후의 조직표면의 흡수선량은 $1.493{\mu}Gy/sec({\pm}2.9%)$로 평가되었다.