Disclosed is a device and method for generating X-rays having different energy levels as well as a material discrimination
system thereof. The method comprises the steps of: generating a first
pulse voltage, a second
pulse voltage, a third
pulse voltage and a fourth pulse
voltage, generating a first
electron beam having a first beam load and a second
electron beam having a second beam load, respectively, based on the first pulse
voltage and second pulse
voltage, generating a first
microwave having a first power and a second
microwave having a second power, respectively, based on the third pulse voltage and the fourth pulse voltage, accelerating the first and second
electron beams respectively using the first and second
microwave to obtain the accelerated first electron beam and the second electron beam, hitting a target with the accelerated first electron beam and the second electron beam to generate a first X-
ray and a second X-
ray having different energy levels. The X-rays having different energy levels generated by the present invention can be used in the non-destructive inspection for large-sized container cargo at places such as Customs, ports and airports, and in realizing the material discrimination for the inspected object.