Comparative Analysis of Digital and Conventional Radiography in Weld Inspection

Abstract

This thesis presents the differences between digital radiography (DR) and conventional film radiography in industrial weld inspection. Data was collected from various existing sources, such as research, standards, and technical literature. The study compares image quality parameters, such as signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), spatial resolution, dynamic range, and exposure latitude. The finding indicates that while traditional film offers excellent spatial resolution, it faces limited exposure latitude and dynamic range. Computed radiography (CR), although faster than film and reusable, still depends on imaging plates and does not provide real-time imaging. Digital detector arrays (DDAs) demonstrate the broadest exposure latitude, the highest SNR, and the widest dynamic range. These advantages make DDAs more effective in detecting small defects across various inspection conditions. Their ability to support digital data management and post-processing also improves safety, documentation, and overall workflow efficiency. In conclusion, film remains suitable when great spatial detail is required, CR is used as a transitional technology, and DDAs offer the most balanced and practical performance for modern industrial weld inspection.