Abstract:
This paper describes the calculation of effective doses for external photons to human body with Monte Carlo method(MCNP4C code).In order to compare with ICRP No.74 Publication,the calcula-tion has considered 20 incident energies between 0.02MeV and 10MeV.This calculation has also considered two incident photon directions: antero-posterior(AP) and postero-anterior(PA).Comparison of the calculated results show that the results calculated by MCNP4C considerably coincide that from ICRP No.74 Publica-tion.