450 kV数字化X光照相诊断系统

介绍了450 kV数字化X光照相诊断系统的研制,该系统由450 kV脉冲X光机和抗辐照X光CCD相机组成。450 kV脉冲X光机输出的X射线脉冲半高宽为40 ns,1 m处剂量为5.210-6 C/kg,焦斑2~5 mm,2.5 m处可穿透20 mm的Fe。抗辐照X光CCD相机接收X光能谱范围为10~450 keV,有效成像面积最高可达100 mm100 mm,空间分辨率最高可达3 lp/mm,具有很强的抗电磁干扰能力。进行爆轰实验时在总防护为40 mm铝板的情况下,450 kV数字化X光照相诊断系统的照相视场可视范围超过70 mm,空间分辨率优于1.2 lp/mm。

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.