Study on Influence of Process Parameters on Image Quality in X-ray Digital Radiography Inspection of Fuel Rod Weld

Abstract

The X-ray digital radiography technology is a detection method which uses detectors to perform radiographic imaging when the object under inspection and the ray source-detector system are relatively stationary. The basic image quality indicators that characterize the image quality of digital radiography technology are image sensitivity and image resolution. In this paper, X-ray digital radiography image quality is taken as the research object, and orthogonal experiment design method is used to study the effect of process parameters on image quality in the digital imaging process of the fuel rod weld. The results show that the image sensitivity fluctuates with the level of factors but the focal length, tube voltage and exposure do not have certain influence on the image resolution. When the image quality indicators are comprehensively balanced, the priority should be given to the factor level that obtains higher image sensitivity. The focal length is the main factor that affects the image sensitivity of fuel rod X-ray digital image. The results of range analysis and variance analysis show that the influencing factors of process parameters on the sensitivity of digital imaging in descending order are: focal length, tube voltage and exposure. For digital radiographic inspection of fuel rod weld, when the focal length is 850 mm, the voltage is 205 kV, the exposure is 25 mA·min, the image quality is stable.