LONG-RANGE ATMOSPHERIC DISPERSION OF RADIOISOTOPES .2. APPLICATION OF THE MESOS MODEL

The MESOS [Lagrangian putt trajectory model] was used to study notional radioactive emissions from several sites in different EEC [European Econonic Community] countries. Successive 3-h releases to the atmosphere of various nuclides were simulated, as they disperse across Europe, using meteorological data bases covering 2 different yr. The results were used to generate annual average levels of contamination in air, and on the ground by dry and wet deposition; these levels were combined with data on population distribution and food production to estimate collective doses arising from direct exposure and ingestion per unit released of each nuclide. For accident risk assessment cumulative probability distributions of exceeding various levels of contamination were estimated at selected receptor points around each source for hypothetical unit releases over periods varying from 3 h to 7 days. In this paper samples results are presented with accompanying analysis and interpretation, including a survey of conditions leading to high levels of contamination at a remote receptor point.