Photochemical aspects of the behavior of the atmospheric radioiodine after the Chernobyl accident

A hybrid stable iodine/radioiodine (¹³¹I) atmospheric photochemistry box model, including 27 reactions, has been developed and solved using algorithmic programme with the application of the Runge-Kutta method of the order 4(5). This modelling offers a clearer view of relationship among aerosol-associated (inorganic iodine compounds, mostly I₂O₂), gaseous inorganic (mostly IONO₂, HOI) and organic (CH₃I) iodine compounds in ambient atmosphere. Summing up the data of the Chernobyl accident, the problem of the standardised method for atmospheric aerosol-associated and gaseous (inorganic and organic) radioiodine activity measurements in the case of the nuclear power plant accident is discussed.