After the accident of atomic power plants in Fukushima, Japan, the removal of radioactive materials released
to environment is most important task and rapid response to the severe problem is required. It is well known that
various biomass have adsorption ability for toxic metal ions from aqueous media. We have evaluated the adsorption
ability of many fiber crops for cesium and strontium ions. As the results, several fiber crops have considerable ability
for the adsorption of such metal ions and are useful for a water and soil purification system in large scale
