Dosimetric Characteristics of the IHEP Neutron Reference Fields

The Institute of High Energy Physics (IHEP) reference radiation fields for calibration include radionuclide neutron sources and high energy fields behind shielding. The ambient dose equivalent rates have been measured using instruments developed specially for measurements in a field of mixed radiation having unknown neutron spectra. The problem of adequate simulation by the IHEP reference neutron fields for user's fields is discussed.