Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Dose coefficients of mesh-type ICRP reference computational phantoms for external exposures of neutrons, protons, and helium ions

  • Yeom, Yeon Soo (Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health) ;
  • Choi, Chansoo (Department of Nuclear Engineering, Hanyang University) ;
  • Han, Haegin (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 (Department of Radiation Oncology, Yonsei University College of Medicine) ;
  • Kim, Chan Hyeong (Department of Nuclear Engineering, Hanyang University) ;
  • Lee, Choonsik (Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health)
  • Received : 2019.11.20
  • Accepted : 2019.12.20
  • Published : 2020.07.25
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Abstract

Recently, the International Commission on Radiological Protection (ICRP) has developed the Mesh-type Reference Computational Phantoms (MRCPs) for adult male and female to overcome the limitations of the current Voxel-type Reference Computational Phantoms (VRCPs) described in ICRP Publication 110 due to the limited voxel resolutions and the nature of voxel geometry. In our previous study, the MRCPs were used to calculate the dose coefficients (DCs) for idealized external exposures of photons and electrons. The present study is an extension of the previous study to include three additional particles (i.e., neutrons, protons, and helium ions) into the DC library by conducting Monte Carlo radiation transport simulations with the Geant4 code. The calculated MRCP DCs were compared with the reference DCs of ICRP Publication 116 which are based on the VRCPs, to appreciate the impact of the new reference phantoms on the DC values. We found that the MRCP DCs of organ/tissue doses and effective doses were generally similar to the ICRP-116 DCs for neutrons, whereas there were significant DC differences up to several orders of magnitude for protons and helium ions due mainly to the improved representation of the detailed anatomical structures in the MRCPs over the VRCPs.

Keywords

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