What is the basic operating principle of Film Badges used in radiation monitoring?

The basic operating principle of Film Badges in radiation monitoring is based on the effect of radiation on film emulsion, which results in a change in density. When ionizing radiation hits the film within the badge, it interacts with the silver halide crystals in the film emulsion. This interaction causes a latent image to form, which can be developed to show a visual representation of the radiation exposure that the badge has recorded.

This method is integral to monitoring occupational exposure to radiation, ensuring that individuals are not exceeding safe limits. The degree of darkening or density change in the film after development can be quantitatively assessed, allowing for an estimation of the amount of radiation exposure over a given period. The practical application is particularly significant in fields such as healthcare, nuclear power, and industrial settings where radiation exposure is a concern.

The other options relate to different types of detection or measurement methods not relevant to the function of Film Badges in radiation monitoring.