Development of monoenergetic neutron calibration fields between 8 keV and 15 MeV

For characterization and calibration of neutron dosimeters and spectrometers, monoenergetic neutron calibration fields have been developed at eight energy points between 8 keV and 15 MeV (8 and 27 keV, 0.25, 0.55, 1.0, 2.0, 5.0 and 15 MeV). Monoenergetic neutrons are obtained by the Sc(p, n) reactions for 8 and 27 keV, and by the 7Li(p, n), T(p, n), D(d, n) and T(d, n) reactions between 0.25 and 15 MeV. Care was taken to reduce background neutrons by parasitic reactions and the scattering of primary neutrons at the target. utron spectrum was characterized by the time-of-flight technique, and the neutron fluence was measured with two independent methods within ±5%. The field has been applied successfully for calibration and characterization of various neutron dosimeters and spectometers.