Air-kerma, incident
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In diagnostic radiology, this is the air kerma from the incident beam on the central x-ray beam axis at focal spot-to-skin distance (i.e. at skin entrance plane) without backscatter. Incident air-kerma can be calculated from the x-ray tube output, where output is measured using a calibrated ionising chamber. (Adapted from ICRP Publication 117, 2010)
ICRP Glossary entry - May 2019
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