Removal of Radioiodine Species from Gaseous Stream on Inorganic Absorbents. Final Report for the Period 1 November 1976 - 31 October 1977

摘要

As a contribution to the development of an impregnated absorbent for the removal of airborne iodine species in the off-gas streams of nuclear facilities the adsorption of exp 131 l-labelled methyl iodide on impregnated alumina was investigated. Alcoa alumina H-151 was impregnated with metal nitrates (Ag, Ag+Cd, Ag+Pb) and with triethylenediamine (TEDA). The removal efficiency of CH sub 3 l was experimentally evaluated, as functions of relative humidity of air-stream, its temperature and flow rate and of the amount of impregnated materials. Under constant temperature, relative humidity and face velocity, the retention of CH sub 3 l increases as the total amount of Ag impregnation increases. In a wet air-stream the only efficient impregnation was found to be with silver nitrate. At constant temperature the CH sub 3 l retention decreases with increasing relative humidity or face velocity of the stream. An increase of temperature favours the CH sub 3 l retention. Very low retention of CH sub 3 l was found on TEDA impregnated alumina. (Atomindex citation 10:490419)