[en] This project has been carried out with four goals; the development of the radiological risk assessment technology for ecosystem, the development of the comprehensive database for radionuclide transfer characteristic in domestic ecosystem, the development of the phyto-technology to remedy the contaminated environment, and the investigation of the biological characteristics on radiation of domestic wildlife. The development of the radiological risk assessment technology for ecosystem includes the work scopes; the upgrade of the biota dose assessment code which is based on the equilibrium model suitable for planned and existing exposure, the performance test through the participation in the IAEA international joint research program, the application study through the radionuclide release scenario test, the development of dynamic models to assess the radiological effect of wildlife at the early stage of nuclear accident together with investigation of the state-of-art dynamic models, and the validation of the models through the analysis of the radiological risk for wildlife due to the Chernobyl and Fukushima accidents. The development of comprehensive database for radionuclide transfer characteristic in domestic ecosystem includes the work scopes; the measurement of concentration ratio for the wildlife biota neighboring the domestic nuclear power plants and the Daedeok nuclear complex, and the establishment of comprehensive data base together with the development of code to manage the domestic ecological data. The development of phyto-technology to remedy the contaminated environment includes the work scopes; the selection of candidate plants through literature survey, and the experimental study on the radionuclide absorption characteristics of candidate plants from the contaminated water and soil through the plant cultivation using ports in a greenhouse. The investigation of the biological characteristics on radiation of domestic wildlife includes the work scopes; the investigation of methodologies for the biological effect of radiation on wildlife, the experimental study on the biological characteristics of wildlife on radiation, and the derivation of the dose-effect relationship for a screening purpose together with field survey to validate.