Calculation of the Coupled Photon-Electron Slowing Down Energy Spectrum in a Homogeneous, Infinite Tissue Equivalent Material

무한평판(無限平板) 조직등가(組織等價) 물질(物質)에서 광자(光子)-전자결합(電子結合) 감속(減速) 에너지 스펙트럼의 계산(計算)

  • Chung, Chan-Young (Department of Nuclear Engineering, Han Yang University) ;
  • Jae, Won-Mok (Department of Nuclear Engineering, Han Yang University) ;
  • Lee, Soo-Yong (Department of Nuclear Engineering, Han Yang University) ;
  • Ha, Chung-Woo (Korea Advanced Energy Research Institute)
  • 정찬영 (한양대학교 원자력공학과) ;
  • 제원목 (한양대학교 원자력공학과) ;
  • 이수용 (한양대학교 원자력공학과) ;
  • 하정우 (한국 에너지연구소 안전관리실)
  • Published : 1983.05.31


A somewhat detailed energy spectra in terms of the track length resulting from coupled electron-photon slowing down are calculated throughout the ICRU standard tissue with uniformly distributed gamma sources of $^{60}Co\;and\;^{137}Cs$, respectively. The calculation was accomplished by utilizing the latest available cross-section data as input to a carefully optimized computer code. In this report, the calculational method is described in detail. Furthermore, results of calculations are given in graphical form. The results show that the energy spectrum defined in terms of differential track length has about same shape although the energies of gamma source are different. The discontinuity in the energy spectrum appears at the energy of $T=(1/T_0+2/m_0c^2)^{-1}$, because a primary photon can not be degrade to a point below this energy.