In 1968 total 94,660 mc of radioactive iodocompound were prepared and distributed to the urers. In order to obtain an effective liver scanning In-113m colloidal of even partical size from a 113Sn-113mIn cow, the eluate(pH;1.5) was examined by a radio paper partition chromatography. It was found that the eluate was composed of two components, ionic from and colloidal form. The ionid from could be eliminated by cation exchange resine and the eluate from the ion exchange resine was of even particle size to give an excellent liver scanning resulst. Labelling of 113mIn to human serum albumine was attempted.