摘要
Abstract
X-ray tubes are widely used in safety inspection and nondestructive testing.The traditional X-ray tube usually generates continuously X-ray.The pulsed X-ray tube described in this paper can gener-ate pulsed X-rays according to user demand,and provide X-ray dose several to ten times higher than that of the continuous X-ray tube during the pulse duration.A dispenser Ba-W cathode is selected as the electron emitter in the pulsed X-ray tube,and a grid electrode is placed in front of the Ba-W cathode to control the electron beam emission.The nominal tube voltage is 225 kV,the maximum pulse current is more than 70 mA,the focus spot is less than 2.0 mm,and the pulse width is adjustable from 20 to 5000 μs.The ima-ging experiment results show that the imaging system composed of the pulsed X-ray tube has better tempo-ral resolution and spatial resolution.Under the condition of obtaining the same image index,the ray dose required by using the pulsed ray tube is about 40％of that of the continuously ray tube,which can reduce the absorbed dose of the tested object,and reduce the size,weight and radiation protection pressure of the imaging equipment.关键词
脉冲X射线管/栅控电子枪/钡钨阴极/X射线成像Key words
Pulsed X-ray tube/Grid-controlled electron gun/Dispenser Ba-W cathode/X-ray imaging分类
电子信息工程
