METHOD FOR LOCAL DEACTIVATION OF METAL SURFACES WITH HARD-TO-REMOVE RADIOACTIVE CONTAMINANTS Russian patent published in 2020 - IPC G21F9/28 

FIELD: nuclear equipment.

SUBSTANCE: invention relates to nuclear engineering. Method of local deactivation of metal surfaces with hard-to-remove radioactive impurities includes anodic polarization of cleaned metal surfaces. Electrochemical treatment is carried out at current density of 0.1–10 A/dm² with simultaneous exposure to radioactively contaminated metal surface of ultrasonic oscillations in frequency range of 18–100 kHz with intensity of 2–20 W/cm². Electrolyte carrier is composite material made of sorbent immobilized between upper and lower moisture-permeable layers and saturated with deactivating solution. Lower layer contacts with cleaned metal surface, and cathode in form of plate or grid is laid on upper layer.

EFFECT: invention increases efficiency and productivity of electrochemical external decontamination of metal surfaces with hard-to-remove radioactive contaminants.

3 cl, 3 tbl, 3 ex