# Kerma, K

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The quotient of the sum of the kinetic energies, dE_{tr}, of all charged particles liberated by uncharged particles in a mass dm of material, and the mass dm of that material.

K = dE_{tr}/dm

The unit for kerma is joule per kilogram (J kg^{-1}) and its special name is gray (Gy).

See also H*(10), Exposure, Hx, **Kerma, K**

Source: ICRP Publication 103