What does a roentgen measure?

A roentgen is a unit of measurement used specifically to quantify exposure to ionizing radiation. It measures the amount of ionization produced in air by X-rays or gamma radiation. This unit is crucial in fields that deal with radiation safety, as it helps professionals assess the potential biological effects of radiation exposure on humans or the environment.

In the context of health and safety, understanding the level of exposure to ionizing radiation is essential for implementing protective measures. Monitoring radiation levels allows safety professionals to ensure compliance with regulations, manage risks, and protect individuals from potential health hazards associated with radiation exposure.

The other concepts represented by the incorrect options focus on different types of hazards unrelated to ionizing radiation. For instance, noise exposure, chemical hazards, and airborne pollutants are measured using different metrics and methodologies, and do not pertain to the unit of roentgen. Hence, C is the precise choice that aligns with the defined purpose of the roentgen measurement.