A new inorganic ion exchanger, zirconium phosphate-ammonium molybdophosphate (ZrP-AMP) has been prepared in granular form, suitable for column operation. The results obtained from TG-DTA, IR and X-ray diffraction studies for this exchanger are presented. The k(d) values for different metal ions were determined and the affinity order was found to be Cs>>Rb>Zr>Ce>rare earths. pH titration curve, breakthrough capacities for cesium in different types of simulated nuclear wastes and elution of cesium from ZrP-AMP column have been studied. Conditions for separation and isolation of cesium from other fission products in simulated waste solutions have been established. The exchanger was found to be stable to ay-radiation dose of 10(8) rads.