[en] To control and predict the internal contamination in human body by radioactive material, measurements of radionuclede in foodstuffs were carried out. These results can be monitored the internal exposure of general population and estimated the accumulation pattern of radioactive materials in the environment. In addition, measurements were made for both radiations and radionuclides of all environmental samples submitted from the nuclear power plants are necessary as the reference data between pre or post-operation plants and as the reference data for use of quality control at Kori No. 1, No. 2 and Wolsung power plant in operation. As neutron activation analysis is developed to a method capable for multielement determination, treatment of a corresponding number of standards appears obviously not to be simple task. Different approches such as relative method, absolute method (the use of a comparator) are presented and evaluated critically in order to put them into common formulation. (Author)