450 kV digital X-ray diagnostic system

This paper introduces a 450 kV digital X-ray diagnostic system composed of a 450 kV pulsed X-ray system and an anti-radiation X-ray CCD camera. The 450 kV pulsed X-ray system is designed according to the principle of bipolar charged Marx generator. The Marx generator is designed in coaxial structure, and low jitter field-distortion switches, isolation inductance and ceramic capacitors are used in the pulse generator to shorten pulse width of output pulse. The generator is connected with an X-ray tube through a high-voltage cable. For a charging voltage of 35 kV per stage, the Marx generator generates a more than 450 kV pulse voltage that is applied to the X-ray tube. The X-ray tube generates a dose of 5.210-6 C/kg at 1 m away for the flash X-radiography with pulse width of 40 ns. The size of X-ray source is 2-5 mm, the anti-radiation X-ray CCD camera receives the X-ray spectrum within the range of 10-450 keV, the effective imaging area is up to 100 mm100 mm, and the spatial resolution is up to 3 lp/mm. The experiment results show that the 450 kV digital X-ray diagnostic system has an imaging area no less than 70 mm, resolution greater than 1.2 lp/mm under the protection of 40 mm thick aluminium plate. It is the ideal tool for high-speed radiation photography.