Study of the stability of iodine oxides (IxOy) aerosols in severe accident conditions

Iodine oxide aerosol are formed during a nuclear severe accident in the containment due to oxidation of volatile iodine either molecular or organic iodide. These oxides may exist under different chemical forms more less stable (I 2 O 4 , I 9 and 5 ). Decomposition rate has be experimentally studied better estimate cycle thus source term. aerosols decompose radiation, whatever surface deposition lead mainly form again gaseous iodine. rates irradiation were determined at 80 °C 120 presence humidity kinetics is rapid. It also appears that x y not thermally temperature effect promotes decomposition. The speciation seems evolve humid environment towards species. Such phenomena have considered simulation software model outside radioactive releases predict course partition aerosol/gaseous forms.