Specifies reference radiations for neutrons in the energy range from thermal up to 20 MeV and neutron fluence rates of up to 10 5 cm - 2 s - 1 corresponding, at a neutron energy of 1 MeV, to dose equivalent rates of up to 100 mSv/h. The following reference radiations are specified: neutrons from radionuclide sources including neutrons from sources in a moderator, neutrons produced by nuclear reactions with charged particles from accelerators, neutrons from reactors. Annex A presents the neutron spectra in the form of table and curves, annexes B and C include the conversion factors from neutron fluence into dose equivalent, absorbed dose and kerma for these spectra.