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.