Analysis of U, Np and Pu in 1AW Solution

The condition of adjusting Np, Pu, U valence to Np(Ⅳ), Pu(Ⅳ) and U(Ⅵ) by H₂O₂ has been studied, and 1.5% H₂O₂ is used to adjust the valency of Np, Pu, U in 6 mol/L HNO₃, after loading and washing. The yields of Pu, Np, U are 99.8%, 119%, 91.5% when they are stripped independently, the decontamination factor of ¹³⁷Cs is 7.4×10⁴. The operation time will be 1-1.5 h for one sample. If ED-XRF is involved to analyze Np and U, this two elements could be stripped together. The yields of U, Np are 102.4%, 93.9%. The results meet the request of analysis and radiation protection for 1AW sample.