Abstract
The exchange-adsorption of radioactive strontium-90 and cesium-137 in batch system by zeolititic tuff from Kawarago, Shiroishi, Miyagi Prefecture was studied. The relation between the affinity of both radioactive cations anp the form of exchangeable cation of adsorbent was researched in sodium chloride solution. In general, the mono-valent forms show the selectivity for strontium-90 except H-form, while the divalent forms do not show so remarkable selectivity. H-form only shows the highest selectivity for cesium-137. Moreover, zeolitic tuff show the higher capacity for these both cations than other clay minerals, for example, kaolinite or montmorillonite. Since the zeolitic tuff is relatively soft mineral and swells very little in water, it is very effective and economical to apply it for the treatment of radioactive aqueous waste.
