Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Dose coefficients of mesh-type ICRP reference computational phantoms for idealized external exposures of photons and electrons

  • Yeom, Yeon Soo (Division of Cancer Epidemiology & Genetics, National Cancer Institute, National Institute of Health) ;
  • Choi, Chansoo (Department of Nuclear Engineering, Hanyang University) ;
  • Han, Haegin (Department of Nuclear Engineering, Hanyang University) ;
  • Lee, Hanjin (Department of Nuclear Engineering, Hanyang University) ;
  • Shin, Bangho (Department of Nuclear Engineering, Hanyang University) ;
  • Nguyen, Thang Tat (School of Nuclear Engineering and Environmental Physics, Hanoi University of Science and Technology) ;
  • Han, Min Cheol (INFN Sezione di Genova) ;
  • Lee, Choonsik (Division of Cancer Epidemiology & Genetics, National Cancer Institute, National Institute of Health) ;
  • Kim, Chan Hyeong (Department of Nuclear Engineering, Hanyang University)
  • Received : 2018.09.17
  • Accepted : 2018.12.11
  • Published : 2019.04.25
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Abstract

In the present study, we established a comprehensive dataset of dose coefficients (DCs) of the new meshtype ICRP reference computational phantoms (MRCPs) for idealized external exposures of photons and electrons with the Geant4 code. Subsequently, the DCs for the nine organs/tissues, calculated for their thin radiosensitive target regions, were compared with the values calculated by averaging the absorbed doses over the entire organ/tissue regions to observe the influence of the thin sensitive regions on dose calculations. The result showed that the influences for both photons and electrons were generally insignificant for the majority of organs/tissues, but very large for the skin and eye lens, especially for electrons. Furthermore, the large influence for the skin eventually affected the effective dose calculations for electrons. The DCs of the MRCPs also were compared with the current ICRP-116 values produced with the current ICRP-110 reference phantoms. The result showed that the DCs for the majority of organs/ tissues and effective dose were generally similar to the ICRP-116 values for photons, except for very low energies; however, for electrons, significant differences from the ICRP-116 values were found in the DCs, particularly for superficial organs/tissues and skeletal tissues, and also for effective dose.

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References

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