The software ESTE was used to assess the spread of contaminated air in terms of parameters that calculate radiation exposure to affected individuals. The computer simulation proved to be a reliable tool for obtaining relevant radiation protection quantities and their dependence on parameters such as the initial source activity, its position, wind direction, and wind velocity. An essential condition for accurate dispersion modelling in urban areas is the evaluation of urban wind fields specific to various environments and atmospheric conditions. The location, structure, and layout of buildings are reflected in the simulation of the behaviour and movement of radioactive air. The modelling considers external exposures, expressed in ambient dose equivalent, and internal exposures, leading to committed effective dose. The ESTE dispersion models have proven extremely useful in obtaining essential parameters for predicting the impact of dispersed radioactivity on individuals in the investigated areas. These data can help implement effective protection measures for people in such areas, where exposure also depends on the configuration of the building structures, which can be taken into account when adopting measures to minimise the exposure of individuals present or moving around. The ESTE code was applied to model the dispersion of Cs-137 in a specific urban environment.

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