Final answer:
The highest occupational exposure for X-ray personnel occurs during fluoroscopy exams due to the continuous nature of the procedure.
Step-by-step explanation:
In the context of diagnoses using X-rays, the highest occupational exposure to radiation for X-ray personnel typically occurs during fluoroscopy exams. Fluoroscopy involves the use of X-rays in real-time to create a moving image of the inside of a patient, which results in higher radiation exposure due to the continuous emission of X-rays during the procedure. This is in contrast to other types of radiographic exams, such as mobile radiography, spinal, and dental exams, where X-rays are emitted in short bursts for static images, thus contributing less exposure to the professionals involved.