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where <math>D</math> is the [[absorbed dose]] at that point, <math>D_L</math> is the distribution of <math>D</math> in unrestricted LET <math>L</math> at the point of interest, and <math>Q(L)</math> is the quality factor as a function of <math>L</math>. The integration is to be performed over <math>D_L</math>, due to all charged particles, excluding their secondary electrons.
[[ICRP Publication 116]], 2010 and [[ICRP Publication 123]], 2013
'''Return to [[ICRP Glossary|Glossary]]'''
== Previous glossary entries ==
=== from [[ICRP Publication 131103]], 2015 2007 and [[ICRP Publication 127]], 2014=== 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>Q(L) =\begin{cases}1, & \text{if } L < \text{10 keV/μm} \\0.32L - 2.2, & \text{if 10} \le L \le \text{100 keV/μm} \\300/\sqrt{L}, & \text {if } L > \text{100 keV/μm}\end{cases}</math> <math>Q</math> has been superseded by the [[radiation weighting factor]] in the definition of [[equivalent dose]], but it is still used in calculating the operational dose equivalent quantities used in monitoring.