Abstract: International Atomic Energy Agency (IAEA)establish basic and detailed requirements for protection against the risks associated with exposure to radiation and for the safety of radiation sources that may deliver such exposure, in which, particularly emphasize to "make an assessment of the nature, magnitude and likelihood of the exposures attributed to the source". It is clear that the assessment of the consequential radiation exposure arising from any releases of radioactive materials to the environment will have to rely on some form of model. This paper summary recent progress in radiation protection policy and radioecology research and primary concludes the basis requirements in assessment model development.