A kind of high-temperature-resistant adsorbent for radioiodine,AgNbO_3/Al_2O_3,was synthesized with the method of mechanical mixing.Compared with traditional silver adsorbent(Ag/Al_2O_3),AgNbO_3/Al_2O_3 adsorbent shows more stable performance at high temperatures.Particularly,the decontamination factor of this adsorbent is far more than that of traditional silver adsorbent at temperatures higher than 650 ℃.Characterization data show the structure of the adsorbent is stable,and it can endure long-time high-t...