Which scenario requires personnel monitoring devices?

• A. When an individual operates a Dental CT.
• B. During routine bite-wing radiographs.
• C. When calibrating the x-ray machine daily.
• D. When handling lead aprons.

Answer: (C)

Monitoring devices are worn to track occupational radiation exposure whenever there is a real chance the operator could receive measurable radiation from the x-ray beam or its scatter. The daily calibration of the x-ray machine is a scenario where the operator is in the beam path or near scatter as settings are checked and adjustments are made. Even though the patient isn’t being scanned in that moment, the QA work involves exposure to radiation, so using a dosimeter helps document and limit the operator’s cumulative dose and ensures compliance with safety guidelines.

Routine bite-wing imaging typically involves low exposure and standard shielding practices, so dosimetry isn’t routinely required for that activity. Handling lead aprons doesn’t entail radiation exposure to the operator, so a monitoring device isn’t needed there.