Assessment of Acute Exposure Dose for Emergent Phosgene Spill

The definition of exposure dose is introduced, based on the shallow model for dense gas dispersion. The concentration of diffusion is converted into exposure dose model. The relationship between exposure dose and downwind distance is discussed, in order to describe the impact of meteorological conditions and spill parameters with a real case of phosgene spill. The curves indicate that with a small amount of leakage and the steady meteorological condition, the peak of exposure dose occurred at few meters away from the source. The results are compared to the acute toxic threshold values of phosgene, and the concerned area is defined.