What is the definition of a Roentgen?

A Roentgen is defined specifically as a unit of measurement for radiation exposure, particularly in the context of x-rays and gamma rays. It quantifies the amount of ionization produced in a specific volume of air by X-ray or gamma radiation. The unit is named after Wilhelm Röntgen, who was the first to discover X-rays.

Understanding the significance of the Roentgen is crucial in fields such as radiology and radiological safety, as it helps professionals quantify and manage exposure to harmful radiation levels. This measurement takes into account the absorbed radiation energy and its potential biological effects, which is critical for ensuring safety in environments where radiation is present.

The other options do not accurately represent what a Roentgen is. For example, while radiation sources are important in discussions of exposure, the term itself does not directly refer to a source. Additionally, methods for measuring temperature and the concept of intensity are completely unrelated to the specific definition of a Roentgen as a unit of radiation exposure.