Abstract
In this paper a Monte Carlo model for describing the atmospheric dispersion ofradionuclides (represented by Lagrangian particles/neutral tracers) continuously releasedinto a stable planetary boundary layer is presented. The effect of variation in release heightand wind directional shear on plume dispersion is studied. The resultant plumeconcentration and dose rate at the ground is also calculated. The turbulent atmosphericparameters, like vertical profiles of fluctuating wind velocity components andeddy lifetime, were calculated using empirical relations for a stable atmosphere.The horizontal and vertical dispersion coefficients calculated by a numerical Lagrangianmodel are compared with the original and modified Pasquill–Gifford and Briggs empiricalσs. The comparison shows that the Monte Carlo model can successfully predict dispersion ina stable atmosphere using the empirical turbulent parameters. The predicted groundconcentration and dose rate contours indicate a significant increase in the affected areawhen wind shear is accounted for in the calculations.
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