Where should a personnel monitoring device be worn during work hours?

• A. On the collar
• B. On the waist
• C. In the pocket of the lead apron
• D. On the shoe

Answer: (A)

Personal dosimeters are worn where they can accurately reflect the radiation reaching sensitive tissues, not be heavily shielded by protective gear. Placing the device at the collar, outside the lead apron, ensures it records exposure to the head and neck from scattered radiation and gives a meaningful estimate of effective dose to those areas. If it were worn at the waist or under the apron, the lead shielding would reduce what the device detects, underestimating exposure to critical regions. A dosimeter in a pocket of the apron or on the shoe wouldn’t capture the relevant exposure either.