Uranium fluorescence analysis in the raffinate solution of nuclear fuel conversion process using time-resolved laser-induced fluorimetry

A simple and new uranium analysis technique for raffinate solution of nuclear fuel conversion process was developed using a time-resolved laser-induced fluorimetry. The addition of 4M-phosphoric acid more than 10 times in volume to the raffinate sample was found to be efficient for obtaining stable uranium fluorescence signal which was not influenced by many fluorescence quenchers. A calibration curve of a good linearity for the fluorescence intensity vs. the uranium concentration was obtained at the range of 3.0 x 10-6 - 6.0-5 M UO2+2 in the raffinate samples. (Author)