The comparison and research of air diffusion factor of nuclear facilities' airflow radioactive contaminant

This article calculates and analyses the diffusion factor through revised Gaussian model, the software model and the wind tunnel experiment measurement model. The trend of the three results is same, but the numeric number has large difference which is about one order of magnitude. The wind frequency and topographical relief mainly affect the diffusion factor. It should take correction to the revised Gaussian model, since it can't accurately reflect the topographical relief's influencing factor, while it can get a good result to correct the wind tunnel experiment measurement model's result. At the same time, it should first make the short-term diffusion factor converse the long-term diffusion factor, then make comparison. At last, some advices of the diffusion factor's calculation are listed which lays the foundation of the radioactive species' ground air concentration and the dose calculation. (authors)