An efficient method for the isolation of iodine-accumulating bacteria was established. A total number of 138 bacterial strains
were grown on agar media containing 125I, and the strains having strong radioactivity were chosen by autoradiography. They were then grown in liquid media containing
125I, and the radioactivity of the cells and the supernatants was determined after centrifugation through silicone oil. Eight
strains were found to remove 78 to 90% of iodine from the media within 24 hours, and corresponding amount of iodine was detected
in their cells. The advantage of this method is in its simplicity and the low detection limit.