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<math>
K = \frac{(dE_{tr})}{dm}
</math>
The SI unit of kerma is joule per kilogram (J kg<sup>-1</sup>), and its special name is [[gray]] (Gy).
‘Kerma’ is an acronym for ‘kinetic energy released in a mass’.
[[ICRP Publication 116]], 2010
== Previous glossary entries ==
=== from [[ICRP Publication 131103]], 2015 2007; [[ICRP Publication 119]], 2012; [[ICRP Publication 120]], 2012; [[ICRP Publication 135]], 2017; and [[ICRP Publication 136]], 2011 === The quotient of the sum of the kinetic energies, <math>dE_{tr}</math>, of all charged particles liberated by uncharged particles in a mass <math>dm</math> of material, and the mass <math>dm</math> of that material. <math>K = \frac{dE_{tr}}{dm}</math> Kerma is defined as a non-stochastic quantity and <math>dE_{tr}</math> is the expectation value of the sum of the kinetic energies. The unit for kerma is joule per kilogram (J kg<sup>-1</sup>) and its special name is [[gray]] (Gy).