Radiation exposure is measured using which SI unit?

The SI unit that is specifically used to measure radiation exposure in terms of the ionization produced in air is the Coulomb per kilogram (C/kg). However, when discussing radiation exposure more generally in clinical and radiological contexts, it is important to recognize the specific applications of other units.

The Gray is the SI unit of absorbed dose, which quantifies the amount of energy deposited by ionizing radiation in a given mass of tissue, while the Sievert is used to measure the biological effect of radiation, factoring in the type of radiation and its impact on human health.

The Roentgen is an older unit that measures ionization in air but is not an SI unit. It has largely been replaced by the SI units for clearer and more standardized communication in scientific and medical fields.

In summary, while the Coulomb per kilogram is technically the correct answer for measuring radiation exposure in standard contexts, understanding the roles of the Gray and Sievert in specific applications enhances comprehension of radiation measurement in practice.