~(99)Tc是高产额的裂变产物核素,由235U热中子裂变的产额为6.13%。随着核燃料燃耗的逐渐加深,锝在乏燃料中的含量不断增加。在乏燃料后处理Purex流程中,乏燃料在溶于硝酸时,锝会以TcO~-_4的形式进入溶解液。在后续的铀钚共去污工艺,锝绝大部分会随铀钚共萃入有机相。实际经验及研究表明,进入有机相的锝会破坏铀钚分离的还原反萃剂-U(Ⅳ)及肼,锝含量高时甚至 ~ (99) Tc is a high-yield fission product nuclide with a yield of 6.13% from 235U thermal neutron fission. With the gradual deepening of nuclear fuel burnup, the content of technetium in spent fuel continues to increase. In the spent fuel reprocessing of the Purex process, technetium enters the solution as TcO ~ -_4 when the spent fuel is dissolved in nitric acid. In the subsequent uranium plutonium were decontamination process, the vast majority of technetium with uranium plutonium was co-extracted into the organic phase. Practical experience and research have shown that the incorporation of technetium into the organic phase can destroy U (Ⅳ) and hydrazine, the uracil-plutonium separation reduction stripping agent, and even when the technetium content is high