Final answer:
When the Source-to-Image Distance (SID) in imaging increases, image receptor exposure decreases due to the inverse square law, meaning less high-energy x-ray photons reach the receptor.
Step-by-step explanation:
When the Source-to-Image Distance (SID) increases in imaging, the image receptor exposure generally decreases. This is because of the inverse square law, which states that the intensity of radiation is inversely proportional to the square of the distance from the source. So, as the distance from the x-ray tube (source) to the image receptor increases, the number of photons reaching the image receptor decreases significantly. This is not related to UV photons as suggested in the options but to the x-ray photons used in medical imaging. Essentially, for a given exposure, if you double the SID, the exposure to the image receptor is reduced by a factor of four.
Therefore, the correct answer is:
- d. Decrease, because less high-energy x-ray photons can enter the eye.