Study on the evaluation methods to determine the radioactivity concentration in low-level radioactive wastes generated from JPDR facilities. Part 2

It is necessary to establish practical evaluation methods to determine radioactivity concentrations of the important nuclides for safety assessment on disposal of radioactive wastes in order to dispose of low-level radioactive wastes generated from various nuclear facilities in JAEA. In this report, it has been studied that the practical evaluation methods such as the scaling factor method or the mean activity concentration method are applied for the important nuclides (H-3, C-14, Cl-36, Ni-59, Co-60, Ni-63, Sr-90, Mo-93, Nb-94, Tc-99, Ag-108m, Cs-137, Eu-152, Eu-154, Ho-166m, α nuclides) of radioactive wastes generated from JPDR facilities. As a result, it has been found that the appropriate methods to determine radioactivity concentrations such as the scaling factor method (Ni-63, Nb-94), the mean activity concentration method (H-3, C-14, Cl-36, Sr-90, Mo-93, Tc-99, Eu-152, Eu-154, Ho-166m, α nuclides) and the theoretical method (Ni-59) can be applied and Co-60, Ag-108m and Cs-137 will be evaluated by gamma measurements from outside of the waste package. (author)