Röntgen refers to the unit of measurement for exposure to ionizing radiation, named after the German physicist Wilhelm Conrad Röntgen, who discovered X-rays in 1895. This unit quantifies the amount of radiation that produces ionization in air, which is crucial for understanding radiation safety and exposure levels in various fields, including medicine and industry. The Röntgen is primarily used in radiology, where it helps assess the amount of radiation patients receive during X-ray procedures. Understanding this measurement is essential for minimizing risks associated with radiation exposure while ensuring effective diagnostic imaging.