Feasibility study on application of CT using γ-ray with double energy to container security inspection

The study object in this research is the attenuation coefficient of linear (ACOL) from an interaction,which is get form the incident γ ray, radiated by a 600 keV (γ ray energy level is Near 137Cs) source and A 1250 keV (γ ray energy is equal to 60Co) source which are promoted by American NIST,interates with No.1–No.92 element. After further research on two groups ACOL of interaction of rays and different meterials, we built a ratio of the ACOL of dual energy γ ray system(it is defined as Mz value). Then, we studied the relations of the ratio and material atom number. We get a quite good linear correlation value of a ACOL Mz of elements No.1 to No.92 and atom number. And, ten kinds of pure materials were choosed to test the ACOL Mz value, and we find the value can be located in the elemental distribution curve area. This rule promoted a important theory basis for the realization of dual energy CT technology which is widely used in container safety inspection.