Abstract
The work of the Aerosol Group at Harwell on the removal of iodine from gas streams is reviewed. Work of other groups is mentioned only where it reflects directly on Harwell work. The main features of the work are: 1. (a) Tests of the behaviour of iodine released into reactor containment vessels, show that rapid sorption on the walls occurred, and that the iodine remaining airborne after periods of order an hour was in nonelemental form. 2. (b) Laboratory and pilot plant studies show that the sorption of iodine on particulate matter and the formation of non-elemental gaseous compounds occurred with varying methods of release of iodine and in COQ as well as air. 3. (c) Tests of iodine absorption in charcoal beds, and tests of the ignition temperature of some charcoals were made to enable the efficient removal systems to be specified. 4. (d) Investigations of the physical chemistry of iodine at low gaseous concentrations enabled one of the non-elemental forms to be identified as nonhyl iodide.
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