What is the unit of measurement for radiation exposure in air?

The unit of measurement for radiation exposure in air is known as the Roentgen (R). This unit specifically quantifies the amount of ionization produced in air by X-rays or gamma rays, which makes it particularly relevant for measuring radiation exposure in environments where these types of radiation are present. The Roentgen provides a direct measure of exposure that is effective in assessing potential biological effects due to radiation.

In contrast, other units such as Gray (Gy) and Sievert (Sv) relate to radiation absorbed doses and biological effects, respectively, rather than exposure in air specifically. The Gray is used to measure the absorbed dose of radiation in any material, while the Sievert accounts for the biological impact of radiation on human tissue, factoring in the type of radiation and the sensitivity of the tissue involved. Curies (Ci), on the other hand, is a unit of radioactivity, indicating the decay rate of a radioactive substance, and does not measure exposure or dose in air.