Kerma, K 1
Kerma, K 1 :
Radiation and Radiological Disasters. The quantity K, defined as: K = dEtr dm where dEtr is the sum of the initial kinetic energies of all charged ionizing particles liberated by uncharged ionizing particles in a material of mass dm. Unit: gray (Gy). Originally an acronym for kinetic energy released in matter, but now accepted as a word. Air Kerma: The kerma value for air. Under charged particle equilibrium conditions, the air kerma (in gray) is numerically approximately equal to the absorbed dose in air (in gray). Reference Air Kerma Rate: The kerma rate to air, in air, at a reference distance of one metre, corrected for air attenuation and scattering. This quantity is expressed in μGy/h at 1 m
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