Radiographic density
Film density is the measure of darkness of a developed X-ray film. It determines contrast and ensures that material defects are easily visible.
Physico-Chemical Mechanism
Film density is created by exposing an X-ray film to radiation. The photons of the X-rays cause a chemical change in the film, which appears as darkness after development.
Metallurgical Relevance & Risks in Welding
Optimal film density allows clear representation of material structure and defects. Too little density leads to poor contrast, blurring details. Too much density can overload the image quality and cause artifacts.
Workshop Practice & Instructions
For good film density, it is important to use the correct exposure time and development process. A contrast of 1:2 to 1:3 is ideal for detecting material defects. If necessary, density can be controlled by adjusting development time or developer.