Optimization Design of Filter Parameters for Energy Spectrums Used in Dual energy X ray Inspection

Abstract:

This paper puts forward a method to use metal slice to filter high energy X ray. In order to eliminate the overlap as well as the unbalanced total energy between two energy spectrums as much as possible, this paper develops a dual energy inspection system model based on the Monte Carlo Method and creates a cost function to choose the optimum metal material and thickness. A practical X ray inspection machine is used to test this method. The result indicates that this metal filter method and concerned filter parameters obviously contribute to the performance improvement of dual energy inspection system, which attests to the effectiveness of this method.

Key words:dual energy X ray; metal filter; Monte Carlo Method; overlap of energy spectrums; cost functions