Abstract

Atmospheric dispersion has been well known in environmental risk assessment. However, one parameter in atmospheric dispersion which is the building downwash was always neglected when calculating the dispersion of radioactive effluent using basic Gaussian dispersion model. In the Gaussian model, this parameter usually replaces by a value which is far from being accurate. The results of can differ almost to half of the actual result. Thus, the building downwash must be included in the calculation for more accurate dispersion results. This work focusses on the development of computer code to calculate the dispersion of radionuclide effluent which emphasis on the building downwash parameters. There are two parts of this work, the first is the basic Gaussian dispersion model computer code, named GD-Nx3 and the second part is the Gaussian dispersion model enhanced with building downwash which called GDb-Nx3. Both computer codes were build using Fortran computer language.

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