The document outlines the syllabus and principles of radiography in mechanical engineering, detailing the interaction of X-rays with materials, imaging techniques, and their applications for detecting internal defects in components. It describes various radiographic methods including film and digital techniques, and discusses the principles of exposure, image quality, and the use of radiation sources such as X-rays and gamma rays. Additionally, it highlights the importance of equipment like penetrameters for quality assurance and the role of different imaging modalities in modern industrial radiography.