Correlation properties of H-3 and C-14 with Co-60 in concentration bottom

10CFR61.55 (a) and (b) regulation allows indirectly radionuclide assay for disposal of low-level radwaste due to difficulty with measuring essential α- or β- emitted nuclides. This method means using scaling factor calculated through correlation ofα- or β-emitted nuclides with γ- nuclide which has systematically similar properties with α- or β- nuclides. In order to obtain scaling factor, every radwaste has to be classified in detail as sample type and plant type owing to difference in operating process of each NPP. The scaling factor related to disposal of radioactive waste in foreign NPPs has been calculated and updated at least every year for Class B and C wastes and biannual assayed for Class A since the beginning of 1980s. Class A, B, and C are divided as a half-life and radioactivity of radionuclides. Meanwhile, the statistic method for the scaling factor of α- or β-emitted radionuclide which was generated from a PWR type of domestic NPPs was expected to different from that of foreign NPPs, so that as such, correlation properties of H-3 and C-14 with Co-60 as key nuclide were investigated. In this study, concentration bottom(CB) as radioactive waste, which was generated from a PWR type of NPPs were partially obtained and analyzed for H-3 and C-14 using distillation and wet oxidation method, and their radioactivity concentrations were drawn up to the database. The correlations of each nuclide were performed by means of linear regression with Arithmetic mean or geometry mean. These methods for obtaining scaling factor have been generally introduced by various equations as a function of γ-emitted nuclide by using statistic program. Thus, H-3 and C-14 which were separated and determined from concentration bottom solution, were evaluated whether to have possibility to the most suitable correlation with key nuclide using statistic method