The International Commission on Radiological Protection (ICRP) and the International Commission on Radiation Units and Measurements (ICRU) have developed reference computational models i.e. ICRP/ICRU voxel models of the Reference Male and Reference Female for calculations of reference dosimetric data, such as specific absorbed fractions (SAFs) –the fraction of energy emitted as a specified radiation type in a source organ that is absorbed per unit mass of target organ- for internal exposures. The task group on dose calculations (DOCAL) of ICRP committee 2 has evaluated SAFs for selected source and target organs in the ICRP/ICRU voxel models. However, published data on SAFs are limited. At the Japan Atomic Energy Agency, SAFs have been evaluated using voxel models and a Monte Carlo code, EGS4-UCSAF, to update a safety assessment 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 organs of interest for internal dosimetry. The sources were assumed to be monoenergetic in the energy range from 10 keV to 10 MeV. Consequently, it was confirmed that SAFs evaluated in the present study agree well with those evaluated by DOCAL, 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.