What is the SI unit of measurement for radiation exposure?

The SI unit of measurement for radiation exposure is indeed the coulomb per kilogram. This unit measures the amount of ionization produced in air by X-rays or gamma rays and provides a direct correlation to the electrical charge produced by radiation in a kilogram of air. It is crucial for understanding the interaction of radiation with matter, particularly in medical and dental settings where radiation exposure is monitored for safety.

The coulomb per kilogram effectively quantifies the radiation's potential to cause biological effects, which is fundamental in the context of radiation safety. This unit is part of the International System of Units (SI), which standardizes measurements across scientific fields.

In contrast, other units listed, such as gray and rad, primarily measure absorbed dose rather than exposure. Gray is the SI unit of absorbed dose, indicating the energy of radiation absorbed per kilogram of matter, while rad is an older non-SI unit that has been largely replaced by the grey. Röntgen is a traditional unit used for measuring exposure to ionizing radiation in air but is not the SI unit. Therefore, the use of coulombs per kilogram aligns with modern standards for measuring radiation exposure and ensuring appropriate safety measures are applied.