[en] Sorbent on a basis of aluminium oxide impregnated by silver nitrate salt was used for the ¹²⁹I capture during reprocessing of spent nuclear fuel at the RT-1 plant. Using adsorption columns decreased ¹²⁹I discharge to the level of sensitivity of analysis. Industrial service of the iodine purification system at the RT-1 plant provided support for validity of the method and reliability of the chosen apparatus for the ¹²⁹I capture