Abstract
This review describes the chemical form and removal of airborne radioiodine released in a loss-of-coolant accident of light water reactor. The chemical form of the iodine is considered to be elemental and partially organic as methyl iodide.
The airborne iodine is removed in the reactor containment by spray and air-filter systems, and the iodine leaked from the containment by another air-filter system. Those air-filter systems consist of impregnated chacoal, HEPA filter and additional installations. The materials impregnated on charcoal for removal of methyl iodide are triethylenediamine, KI and SnI2. Those charcoals, however, should be operated under the condition of relative humidity less than 97%. In order to use the charcoals with good performance, it is necessary to have information on the deterioration due to adsorption of impurities in the enviromental atmosphere.
