Final answer:
The most appropriate place to wear a film badge when wearing a lead apron is on the outside of the apron at the collar level. The correct answer is 1.
Step-by-step explanation:
Wearing a film badge on the outside of a lead apron at the collar level is the most suitable placement.
This is because the purpose of a film badge is to measure the external radiation exposure received by an individual, and placing it on the outside of the apron allows for accurate measurement of the radiation exposure to the head and neck area.
Wearing the film badge on the inside of the apron or at the level of the gonads would not provide an accurate measurement of the radiation exposure to the individual wearing the lead apron. The correct answer is 1.