What is the expected result when using gamma ray or high voltage X-ray radiography without lead screens?

When using gamma ray or high voltage X-ray radiography without lead screens, the expected result is mottling of the film. This occurs because lead screens are designed to reduce the amount of scatter radiation that reaches the film or digital detector. Without these screens, more scatter radiation can hit the film, leading to inconsistent density and contrast in the radiographic image. Mottling is characterized by variations in the film density, which is caused by the scattered rays that can create a grainy or speckled appearance.

In high energy radiography, the scatter radiation is prevalent due to the high penetrating power of gamma rays and high-voltage X-rays. As a consequence, the absence of lead screens allows for increased scatter, resulting in less clear images and a reduction in overall image quality. This is why the presence of lead screens is critical in such imaging techniques to ensure consistent and high-quality radiographic results.