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=== from [[ICRP Publication 103]], 2007 ===
The factor characterising the biological effectiveness of a radiation, based on the ionisation density along the tracks of charged particles in tissue. <math>Q </math> is defined as a function of the unrestricted linear energy transfer, <math>L_\infty</math> (often denoted as <math>L</math> or LET), of charged particles in water:
<math>
