Which of the following is an advantage of using a film badge?

Using a film badge as a radiation monitoring device has the significant advantage of being reusable. Film badges are designed to be worn by individuals who may be exposed to ionizing radiation. They work by capturing and storing the radiation exposure on a photographic film. Once the film has been developed, it provides a measurement of the accumulated exposure over a specific period, allowing for ongoing monitoring of radiation levels.

The reusability of film badges is beneficial because it reduces waste and lowers overall costs in a clinical or laboratory environment where multiple personnel require monitoring. By reusing the same badge after it has been processed, facilities can maintain diligent radiation safety protocols without having to continuously replace monitoring devices, thus fostering both economy and environmental consideration.

In contrast to the other options, a film badge indeed provides a permanent record once developed, can be cost-effective rather than expensive, and is capable of detecting radiation exposure effectively, making it a reliable tool in radiation safety management.