Final answer:
The device called a grid or Bucky is used in radiographic imaging to protect the Image Receptor from scatter radiation by absorbing it, which preserves image quality.
Step-by-step explanation:
The device used to protect the Image Receptor (IR) from being fogged by scatter radiation in radiographic imaging is a grid or Bucky. The grid is placed between the patient and the IR, and it is designed to allow the primary x-ray beam to pass through while absorbing scatter radiation that could degrade the image quality. This ensures that only the x-rays that have directly passed through the area of interest reach the IR, thus improving the contrast and sharpness of the image.