Calculation of cobalt-60 primary and scatter dose in layered heterogeneous phantoms using primary and scatter dose spread arrays.

DOI
  • 岩崎 晃
    School of Allied Medical Sciences, Hirosaki University

抄録

A method of making 60Co γ-ray primary and scatter dose spread arrays in water is described. The primary dose spread array is made using forward and backward primary dose spread equations (h1 and h2) where both equations contain a laterally spread primary dose equation (G), made from measured dose data in a cork phantom. The scatter dose spread array is made using dierential scatter-maximum ratio (dSMR) and differential backscatter factor (dBSF) equations (k1 and k2), where both equations are made to be continuous on the boundary. Primary and scatter dose calculations are performed along the beam axis in layered cork heterogeneous phantoms. It is found, even for 60Co γ-rays, that when a small tumor in a lung is irradiated with a field that just surrounds the tumor, the beam entrance surface and lateral side of the tumor may obtain no therapeutic dose, because of loss of longitudinal and lateral electronic equilibrium, and when a large tumor in a lung is irradiated with a field just surrounding the tumor, the lateral side of the tumor may obtain no therapeutic dose due to loss of lateral electronic equilibrium.

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詳細情報 詳細情報について

  • CRID
    1390001204332252032
  • NII論文ID
    130003997946
  • DOI
    10.11182/jastro1989.5.107
  • ISSN
    18819885
    10409564
  • 本文言語コード
    en
  • データソース種別
    • JaLC
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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