Final answer:
Moving the Image Intensifier (II) closer to the patient results in an increase in dose due to the higher intensity of X-rays in a more narrowly collimated beam, following the inverse square law of radiation.
Step-by-step explanation:
By moving the Image Intensifier (II) closer to the patient, the dose will increase. This is because when the II is closer to the patient, the X-ray beam can be more narrowly collimated and the amount of scatter radiation can be reduced, resulting in a higher intensity of X-rays reaching the patient in the area of interest. Therefore, the dose is increased as there is a higher concentration of X-ray photons in the smaller, targeted area. This principle is in accordance with the inverse square law of radiation, which states that the intensity of radiation is inversely proportional to the square of the distance from the source. As the distance decreases, the intensity (and thus the dose) increases.