Abstract: Considering the exposure to the surrounding public caused by coastal nuclear power plant radioactive effluents, the largest contribution is caused by ¹⁴C. During dose evaluation of the key route feeding from marine organisms, the ¹⁴C concentration will directly affected the rationality. In this study, the specific activity equilibrium model was adopted, as well as consideration of the actual carbon content of sea water and marine organisms in Fuqing NPP. Calculating ¹⁴C concentration factors of different species of marine organisms, which were verified by comparing with measured values and IAEA rec-ommended values of some marine organisms on sites. As conclusions, ¹⁴C concentration factors suitable for the Fuqing NPP area were obtained. It is recommended to take 6 800 for fish, 5 300 for algae, 5 000 for crustaceans and 4 500 for mollusks. They can be applied to public dose evaluation by dividing different age groups and calculate the public personal effective dose caused by ¹⁴C intake from marine organisms. These recommended values can be applied to the assessment of the public radiation dose caused by the effluents from the coastal NPP.

Key words: ¹⁴C, concentration factor, marine organisms, dose evaluation