Dose conversion coefficients for Chinese reference adult male and female voxel phantoms from idealized neutron exposures

摘要

A new set of fluence-to-dose conversion coefficients based on the Chinesereference adult voxel phantoms CRAM and CRAF are presented for six idealizedexternal neutron exposures from 10-8 MeV to 20 MeV. The voxel phantoms CRAM andCRAF were adjusted from the previous phantoms CNMAN and CNWM respectively, andthe masses of individual organs have been adjusted to the Chinese referencedata. The calculation of organ-absorbed doses and effective doses wereperformed with the Monte Carlo transport code MCNPX. The resulting doseconversion coefficients were compared with those published in ICRP Publication116, which represents the reference Caucasian. The organ-absorbed doseconversion coefficients of most organs are in good agreement with the resultsin ICRP Publication 116, however, obvious discrepancies are observed for someorgans and certain geometries. For neutrons with energies above 2 MeV, theeffective dose conversion coefficients of Chinese reference adult are almostidentical to those of ICRP Publication 116 in AP, PA, ROT and ISO geometries.When energies range from 10-8 MeV to 1 MeV, differences are within 10% in AP(5%), PA (8%) and ROT (-4%) geometries. However, relatively large discrepanciesare shown in lateral and ISO geometries when energies are below 1 MeV, withdifferences of -15% for LLAT, -20% for RLAT and -12% for ISO, respectively.