What is the unit of measurement of exposure in radiation detection?

The unit of measurement for exposure in radiation detection is indeed Coulombs per kilogram (C/kg). This unit specifically quantifies the amount of ionization produced in air by X-rays or gamma rays. Exposure refers to the ability of radiation to produce ionization in a given mass of air, which is crucial in assessing the potential biological effects of radiation.

Using Coulombs per kilogram allows for a direct measurement of the electrical charge (in coulombs) produced by the radiation in a specific mass of air (in kilograms), making it a suitable unit for evaluating exposure levels. This measurement is foundational in radiation safety and monitoring, as it helps professionals understand how much ionizing radiation is reaching an area or affecting individuals.

In contrast, Joules per kilogram relates to energy deposition rather than exposure, while liters per minute is a unit of flow rate that does not pertain to radiation measurement. Electron volts is a unit of energy used in particle physics, but it does not effectively measure exposure in a practical radiation context.