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Using ICRP/ICRU voxel models to evaluate specific absorbed fractions

Kinase, Sakae   ; Kimura, Masanori ; Takahara, Shogo  ; Homma, Toshimitsu

At the Japan Atomic Energy Agency, SAFs have been evaluated using human voxel models and a Monte Carlo code to update a level 3 probabilistic safety assessments (PSA) code which provides doses after an accidental release of radioactive material to the atmosphere. In the present study, the ICRP/ICRU voxel models were applied to evaluating SAFs for both photons and electrons in some organs. The sources were assumed to be monoenergetic in the energy range from 10 keV to 10 MeV. The radiation transport was simulated using the Monte Carlo code EGS4 in conjunction with an EGS4 user code, UCSAF. Consequently, it was confirmed that SAFs evaluated in the present study agreed well with those evaluated by the task group on dose calculations of ICRP committee 2, except for the cross-irradiation SAFs for electrons with low energies. The cross-irradiation SAF evaluations were found to be subject to the treatment of bremsstrahlung photons and the set of cutoff energies in the radiation transport.

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