Abstract
Cesium was separated from rubidium by the chromatographic ion-exchange method with Duolite C-3. After a sample solution was lead to the resin column, rubidium and cesium were eluted with 0.35M hydrochloric acid solution and 3 M hydrochloric acid solution, respectively. The procedure was applied to the determination of radio cesium-137 in soil, total diet, vegitable, fish, and skim milk. The overall chemical recovery of cesium was 94.7 % on the average for the samples. The amount of rubidium in the final cesium fraction was decreased to less than 10-3 part of the initial amount. The chemical procedure for ten samples took about 3 days.
