Changes

Quantity for ionising uncharged particles, defined by the quotient of <math>dE_{tr}</math> by <math>dm</math>, where <math>dE_{tr)}</math> is the mean sum of the initial kinetic energies of all the charged particles liberated in a mass <math>dm</math> of a material by the uncharged particles incident on <math>dm</math>, thus:

K = \frac{(dE_{tr})}{dm}

‘Kerma’ is an acronym for ‘kinetic energy released in a mass’. (Adapted from [[ICRP Publication 116]], 2010)

=== 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^-1) and its special name is [[gray]] (Gy).