What is the recommended positioning of a dosimeter for pregnant workers?

The recommended positioning of a dosimeter for pregnant workers is at waist level over the apron. This placement ensures that the dosimeter accurately measures the radiation exposure to the fetus, which is primarily located in the lower abdomen area. By positioning the dosimeter at waist level, it accounts for the radiation exposure that may be received by the fetus during occupational duties, while also keeping it outside protective lead aprons that are designed to shield the torso from radiation.

Positioning the dosimeter elsewhere, such as inside the apron or at chest level, could underestimate the exposure to the fetus, as the protection provided by the apron could obscure the dosimeter's readings. Similarly, placing the dosimeter on the wrist or on the head would not accurately reflect the dose received at the fetal level, as these areas are not representative of the radiation exposure risk to the developing baby. Therefore, the waist-level position is specifically recommended to provide a reliable measurement of radiation exposure for pregnant workers.