Development of High-Sensitive Plutonium Valence State Spectrometer

A high-sensitive plutonium valence state analysis installation has been developed by using liquid waveguide capillary cell(LWCC) and optic fiber. A 0.5m LWCC is connected via optical fibers to a spectrophotometer. The analysis installation is small and portable, the operation is simple and rapid. The application of LWCC and optic fiber, improves markedly the sensitivity of the analyzer. Furthermore, it can be used to analyze remote radioactive samples. The determination precisions of Pu(Ⅲ), Pu(Ⅳ)and Pu(Ⅵ)are 2.3%, 3.7% and 5.6% respectively for Pu solution and the detection limits of the method of them are 0.99mg/L, 1.08mg/L and 0.03mg/L respectively. Therefore the installation has the prospective application in the analysis of Pu valence state in the nuclear fuel reprocessing.