From which sources does about 95% of technologist exposure originate?

• A. Fluoro and portable exams
• B. CT and MRI
• C. X-ray rooms and CT suites
• D. Ultrasound and fluoroscopy

Answer: (A)

Most occupational exposure for radiologic technologists comes from scatter radiation produced during fluoroscopic procedures and from bedside or portable radiography.

Fluoroscopy involves the X-ray beam being on for extended periods as images are acquired in real time. The technologist and other staff are often close to the patient and the beam, so a substantial amount of scatter radiation reaches them despite shielding and distance. The cumulative dose from these procedures tends to be high because the work is continuous or repetitive, and it often requires standing near the patient to operate the equipment, position the patient, and manage the imaging field.

Portable exams add to exposure because the unit must be moved into patient rooms, sometimes with limited shielding and less ideal distances. The technologist is frequently on the near side of the beam to perform positioning and alignment, leading to notable scatter exposure over the course of multiple views and procedures.

Ultrasound does not use ionizing radiation, so it does not contribute to radiologic staff exposure. CT does involve ionizing radiation, and technologists do receive exposure in the CT environment, but the highest and most frequent sources of occupational exposure are fluoroscopy and portable radiography due to the combination of high scatter and close, repeated proximity to the patient.