Final answer:
The dosimetry badge should be worn inside the lead apron, at collar level, when taking diagnostic radiographs.
Step-by-step explanation:
When taking diagnostic radiographs, the dosimetry badge should be worn inside the lead apron, at collar level. The dosimetry badge is a tool used to measure the amount of radiation exposure that a person receives. Placing the badge inside the lead apron, at collar level, ensures that it accurately measures the radiation exposure to the person's body.