The unit of linear energy transfer is joule per metre J m<sup>-1</sup>, often given in keV μm<sup>-1</sup>.
''High LET radiation'': Radiation with capacity, by its own or by the secondary radiations it generates, of See [[high linear energy transfer higher than around 10 keV μm<sup>-1</sup>. Normally high LET radiation is assumed to include protons, neutrons ]] and alpha particles (or other particles of similar or greater mass) except for protons having energies greater than around 4 MeV. ''Low LET radiation'': Radiation with [[low linear energy transfer (LET), normally assumed to comprise photons (including X rays and gamma radiation), electrons, positrons and muons. High energy (>4 MeV) protons are considered to be a low LET radiation]].
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== Previous glossary entries ==
=== from [[ICRP Publication 131]], 2015 ===