When wearing a waist-level dosimeter in addition to a collar level dosimeter, where should the waist-level dosimeter be positioned?

The waist-level dosimeter should be positioned on the anterior surface of the body at waist level because this positioning allows for optimal monitoring of radiation exposure to the areas of the body most likely to receive exposure during fluoroscopic procedures. This placement helps assess the dose received by vital organs, including the reproductive organs, which are sensitive to radiation.

By placing the dosimeter on the anterior surface, it ensures that it accurately reflects the radiation dose in the direction that the majority of the scatter radiation will come from during procedures. Additionally, this positioning complements collar level dosimetry by providing a more comprehensive understanding of radiation exposure in different body regions.

Other placements, such as positioning the dosimeter on the posterior surface or below the knee level, would not provide an accurate measure of the radiation dose received by the main body during fluoroscopy. Likewise, wearing it on the shoulder under an apron may shield the dosimeter from radiation exposure, thus not providing reliable readings of the dose received at waist level.