Where should a dosimeter be worn for external dose monitoring?

Where should a dosimeter be worn for external dose monitoring?

• A. Waist outside protective apparel
• B. Breasts outside protective apparel
• C. Collar outside protective apparel
• D. Waist inside protective apparel

Answer: (C)

The main idea is to place the dosimeter where it will best represent the radiation that the body actually receives when protective gear is worn. With a lead apron in use, the torso is shielded, but the head and neck remain more exposed to scatter and leakage. Putting the dosimeter at the collar outside the apron captures this exposure and provides a meaningful measure of external dose for areas that are not protected, making it the best choice. If the dosimeter were worn under the apron or at a location that would be shielded, it would underestimate the true exposure. Some programs also use an additional dosimeter under the apron to assess torso dose, but the collar outside position is the standard for external monitoring.

The main idea is to place the dosimeter where it will best represent the radiation that the body actually receives when protective gear is worn. With a lead apron in use, the torso is shielded, but the head and neck remain more exposed to scatter and leakage. Putting the dosimeter at the collar outside the apron captures this exposure and provides a meaningful measure of external dose for areas that are not protected, making it the best choice. If the dosimeter were worn under the apron or at a location that would be shielded, it would underestimate the true exposure. Some programs also use an additional dosimeter under the apron to assess torso dose, but the collar outside position is the standard for external monitoring.