What is the function of a grid?

The correct choice identifies the primary role of a grid in radiography, which is to absorb scattered radiation. When X-rays pass through an object, they can interact with the tissues and structures, causing some of the radiation to scatter. This scattered radiation can degrade the quality of the image by contributing to a fog or noise effect, making it difficult to discern the finer details of the structure being imaged.

Grids are designed to be placed between the patient and the X-ray film or detector. They consist of a series of lead strips oriented parallel to one another, which allow the primary, unscattered X-rays to pass through while absorbing much of the scattered radiation before it reaches the imaging receptor. By using a grid, radiologists and technicians can improve the contrast and overall quality of the diagnostic images, ensuring that only the intended primary radiation contributes to the final image.

In this context, while the other options touch on various interactions involving radiation, they do not represent the primary function of a grid in radiographic imaging.