Decontamination of Radioactive Contaminants Using Reactive Microemulsion of Organic Acid in Supercritical Carbon Dioxide

摘要

In order to decontaminate radioactive waste, citric or oxalic acids dispersed in SF-CO_2 in the form of a microemulsion by polyoxyethylene (2) nonylphenyl ether (NP-2) was applied to ferrites present on clothes and pipes at 323 or 353 K, 25 MPa. Citric acid in the core of the microemulsion was effective for the dissolution of ferrite on the pipes at 353 K. The addition of a reducing agent, Fe(II), effectively removed CoFe_2O_4 from clothes. Oxalic acid was also effective for the removal of CoFe_2O_4 from clothes.