Which term has replaced exposure in describing the amount of energy transferred to a mass of air by the photons?

Name: Which term has replaced exposure in describing the amount of energy transferred to a mass of air by the photons?
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Air kerma is the term that has replaced exposure in describing the amount of energy transferred to a mass of air by the photons. It is measured in units of Gray (Gy) and represents the amount of energy absorbed per unit mass of air.

Which Term Has Replaced Exposure in Describing the Amount of Energy