What is a definitive safety measure for x-ray personnel when using lead aprons?

The definitive safety measure for x-ray personnel when using lead aprons is the proper positioning of the film badge. The film badge, or dosimeter, is designed to measure the amount of radiation exposure an individual receives while working in environments where they are at risk of exposure to ionizing radiation. By ensuring that the film badge is positioned correctly, typically outside the lead apron at the collar level, it can provide an accurate indication of radiation exposure.

This practice is crucial because it allows personnel to monitor their exposure levels and ensure that they remain within safe limits, according to regulatory standards. If the film badge is improperly positioned underneath the lead apron, it could underestimate the radiation exposure, leading to potential safety risks. Proper badge placement is essential in maintaining oversight of radiation safety and ensuring that personnel are adequately protected in their working environment.