STUDIES ON THE UPTAKE OF CESIUM BY GEL [KMG3(SI3ALO10)F-2] ORDINARY PORTLAND-CEMENT ADMIXTURES

Sorption capacity of admixtures of hydrothermal gel close to [KMg3(Si3 AlO10)F-2] and ordinary portland cement (OPC) for Cs has been investig ated at room temperature. The gel containing admixtures exhibit select ive Cs uptake while OPC alone adsorbs negligible amount of radioactive Cs. Selectivity of the gel-OPC admixtures for Cs has been examined in presence of 500 times concentrated solution of competing cations: Na,K+,Mg2+,Ba2+,Ca2+. The data suggests that the gel-OPC admixtures exhi bit good Cs retention capacity. Large cations like K+ and Ba2+ are fou nd to be more competing than Na+ and Mg2+ which have comparatively sma ller ionic radii.