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Kerma

http://en.wikipedia.org/wiki/Kerma_(physics)

http://www.iso.org/iso/catalogue_detail?csnumber=31895

For indirectly ionizing (uncharged) particles, \(K= \frac{dE_{tr}}{dm}\), where \(dE_{tr}\) is the mean sum of the initial kinetic energies of all the charged ionizing particles liberated by uncharged ionizing particles in an element of matter, and \(dm\) is the mass of that element.

"Kerma" is the sum of the initial kinetic energies of all the charged particles liberated by uncharged ionizing radiation (i.e., indirectly ionizing radiation such as photons and neutrons) in a sample of matter, divided by the mass of the sample.

K