Which provides a radiograph with better contrast and sensitivity - X-ray or Gamma ray?

X-rays provide better contrast and sensitivity compared to gamma rays due to their higher energy and shorter wavelengths. This allows X-rays to produce images that can distinguish finer details in the material being inspected. Contrast is crucial in radiographic testing as it affects the visibility of anomalies and defects within the welded structures.

Additionally, X-ray systems typically utilize various techniques such as variable exposure times and film processing methods that enhance image quality, further improving the sensitivity to detect subtle variations in the material density. This results in a clearer representation of internal features and flaws.

In contrast, gamma rays are generally used for specific applications where penetration power is more critical, such as thick materials or large structures; however, they tend to provide less detail and lower contrast. Therefore, for applications requiring high sensitivity and contrast, X-rays are the preferred choice in radiography.