Abstract: Through high-temperature nuclide loss tests, mixed dissolution tests and interference influence studies, a suitable pretreatment method for radioactive organic deposits was formed. The high-temperature carbonization + mixed acid treatment process has a mild reaction without liquid splashing, reducing the probability of aerosol generation. The recovery rates of the nuclides (⁹⁰Sr, ¹³⁷Cs, ²⁴¹Am, ²³⁹Pu) are all greater than 91%. The actual samples can be completely converted into aqueous solutions after being treated by this method. The relative standard deviations of the measurement results of the nuclides are all less than 9%, providing an accurate data basis for the subsequent treatment and disposal of high-level radioactive organic deposits.

Key words: organic deposits, degradation of material, pretreatment