Abstract
The focus of this paper is locating and quantifying the diffusion source of 137Cs by using observation data collected from monitoring stations. The estimation method is firstly tested in synthetic experiments and then verified with real 137Cs concentration data of Fukushima accident. An atmospheric dispersion simulation system is used to support particle diffusion model. Besides, ridge regression is applied to calculate release rate. In terms of location estimation, posterior function of the source location can be deduced according to Bayesian inference. particle swarm optimization (PSO) method is implemented to locate diffusion source.
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