What is the function of lead screens in radiography?

The function of lead screens in radiography is to increase photographic action and absorb scattered radiation. Lead screens are used in conjunction with radiographic films to improve the contrast and definition of the image. When X-rays pass through the object being examined, some of these rays may scatter in different directions due to interactions with the materials in the object. The lead screens help absorb some of this scattered radiation, which would otherwise fog the image and reduce clarity.

By increasing the photographic action, lead screens enhance the film's sensitivity to the X-rays that do reach it, allowing for a clearer and more defined image. This is particularly important in radiographic testing, as the clarity and detail of the image are crucial for identifying defects or irregularities in the material being inspected. In sum, lead screens play a vital role in improving image quality by mitigating the effects of scattered radiation and maximizing the effectiveness of the X-ray exposure.