Spectrophotometric method for precision determination of elements of the nuclear fuel cycle

Published data on precision spectorphotometric determination of U, Th, Pu, and other elements of the nuclear fuel cycle in solutions on a two-channel analyzer with the relative random uncertainty Sr = 0.1–0.2% are summarized. The method was used for certification and fabrication of Pu and U total weight fraction standards for mass spectrometer calibration. New data on precision determination of U, Ru, Er, Gd, Sm, Re, and Tc on serial Shimadzu UV devices in the photometric mode with the relative random uncertainty Sr = 0.02–0.04% are presented. The relative total uncertainty that can be attained with the spectrophotometric method is as low as 0.03–0.05%, which makes this method competitive with other precision methods used.