Final answer:
The film badge used for radiation exposure monitoring should be positioned at collar level, outside the protective apron to ensure an accurate reading of the radiation dose received by the body.
Step-by-step explanation:
When wearing a "film badge" as a personnel monitoring device, it is important to position it in a place where it will accurately record the amount of radiation exposure. According to best practices in radiation safety, the film badge should be worn at collar level, outside the protective apron. This positioning ensures that the badge captures the dose of radiation to the chest area, which will represent exposure to critical organs such as the thyroid gland and the eyes, as well as being indicative of the overall exposure to the rest of the body if lead aprons are worn properly.
Monitoring exposure to radioactivity carefully is crucial for individuals working with or around radioactive materials. Film badges are a simple yet effective monitoring tool, as the degree of fogging on the film, caused by exposure to radiation, is proportional to the amount of radiation present. To maintain proper monitoring protocols and ensure accurate readings, it's essential that the film badge is not placed under the protective apron, which would shield it from radiation and result in an inaccurate reading.