Twelve experimental runs on molecular iodine removal by sprays were carried out in the 95m3 PSICO 10 model containment vessel (MCV). Both service water and a water solution containing 1% sodium thiosulphate were sprayed through two different nozzles; the elemental iodine removal half-times obtained by spraying service water do not differ greatly from those found by spraying thiosulphate solution. The sprayed solution was, in some cases, recirculated for a period ranging from 1 to 11 h without any release of iodine to the atmosphere. Some runs were performed with fractions of the MCV volume not sprayed. The elemental iodine removal half-times in the sprayed and unsprayed regions do not essentially differ.