An unacceptable use of radiation is which of the following?

The use of fluoroscopy for the purpose of fitting shoes is considered an unacceptable use of radiation due to the unnecessary exposure it provides to patients, particularly children, who are often the primary users of such services. Fluoroscopy involves using a continuous X-ray beam to visualize objects in real-time, and while it can be a valuable tool in certain medical contexts, using it for non-essential purposes like shoe fitting does not justify the associated radiation risk. The potential for harm far outweighs any benefit gained from using fluoroscopy in this context.

In a clinical setting, the aim is to minimize radiation exposure while still achieving diagnostic or therapeutic goals. The practice of shoe fitting, however, can be adequately accomplished without the use of radiographic technology, making this application inappropriate and unnecessary.

The other options listed, while related to healthcare practices, do not pertain to the use of radiation in a manner that is deemed unethical or unjustifiable in the same way that fluoroscopy for shoe fitting does.