The raw materials used for iodization are hafnium sponge, high purity iodine and hafnium metal wire. Sponge hafnium iodization is acid-washed, washed to remove impurities adsorbed on its surface, and dried in an oven for 10 hours to remove moisture adsorbed on the surface. After fully drying, add to the self-made iodization equipment, vacuum, and add a certain amount of high purity iodine for iodization reaction after the vacuum degree reaches the required requirements.