Roentgen

The roentgen is a unit used to measure the amount of ionizing radiation, specifically X-rays, that passes through air and causes ionization. Named after Wilhelm Röntgen, who discovered X-rays, it quantifies how much radiation is produced or received, helping to assess exposure levels for safety and medical imaging. One roentgen corresponds to the amount of radiation that produces a specific level of ionization in a certain volume of air. It is primarily used in radiology and radiation protection to ensure exposures stay within safe limits.