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== Previous glossary entries ==
=== from [[ICRP Publication 103136]], 2007 2017 === A practical method (function or numerical value) used to represent relative biological effectiveness for a specific type of radiation based on existing scientific knowledge and adopted by consensus or via recommendations. Within the system of human radiological protection it is used to define and derive the equivalent dose from the mean absorbed dose in an organ or tissue. === from [[ICRP Publication 127]], 2014 and [[ICRP Publication 139]], 2018===
A dimensionless factor by which the organ or tissue absorbed dose is multiplied to reflect reflect the higher biological effectiveness effectiveness of high-linear energy transfer (LET ) radiations compared with low-LET radiations. It is used to derive the equivalent dose from the absorbed dose averaged over a tissue or organ.
=== from [[ICRP Publication 116123]], 2010 and [[ICRP Publication 120]], 2012 2013 ===
A dimensionless factor by which the mean absorbed dose in an organ or tissue absorbed dose , D<sub>T</sub>, is multiplied to reflect the relative biological effectiveness of high-LET radiations compared with photon low-LET radiations. It The product of w<sub>R</sub> and D<sub>T</sub> is used to derive the equivalent dose from in the mean absorbed dose in an organ or tissueT.
=== from [[ICRP Publication 119]], 2012 ===
The radiation weighting factor is a dimensionless factor to derive the equivalent dose from the absorbed dose averaged over a tissue or organ, and is based on the quality of the radiation.
=== from [[ICRP Publication 123116]], 2013 2010 and [[ICRP Publication 120]], 2012 === A dimensionless factor by which the organ or tissue absorbed dose is multiplied to reflect the relative biological effectiveness of high-LET radiations compared with photon radiations. It is used to derive the equivalent dose from the mean absorbed dose in an organ or tissue. === from [[ICRP Publication 103]], 2007 ===
A dimensionless factor by which the mean absorbed dose in an organ or tissue, D<sub>T</sub>, absorbed dose is multiplied to reflect the relative higher biological effectiveness of high-LET radiations compared with low-LET radiations. The product of w<sub>R</sub> and D<sub>T</sub> It is used to derive the equivalent dose in from the absorbed dose averaged over a tissue or organ or tissue T.