Quasi-monoenergetic neutron reference fields in the energy range from thermal to 200 MeV

Abstract

Well-characterised neutron fields are a prerequisite for the investigation of neutron detectors. Partly in collaboration with external partners, the PTB neutron metrology group makes available for other users neutron reference fields covering the full energy range from thermal to 200 MeV. The specification of the neutron fluence in these beams is traceable to primary standard cross sections.

Digital neutron/gamma discrimination with an organic scintillator at energies between 1 MeV and 100 MeV

“…Neutron energy spectra derived from these data (Fig. 10) are also comparable with previous measurements made with conventional NIM-type electronics at neutron energies between 5 and 100 MeV [21].…”

“…10 normalised to unity, after correcting the measurements for the efficiency of the detector. The spectra agree within 5% of previous measurements at iThemba LABS using traditional analogue electronics [21]. The width of the quasi-monoenergetic neutron peak is dominated by contributions from the energy loss of the proton beam in the Li target and the intrinsic time resolution of the scintillator, and not the timing resolution of the digital data acquisition system.…”

EURADOS IC2012N: EURADOS 2012 intercomparison for whole-body neutron dosimetry

“…Monoenergetic neutrons with the energy (248+10 keV) were produced at the accelerator facility of the PTB (4) . Four dosemeters were irradiated with normally incident neutrons on an ISO water phantom ( phantom-to-target distance: 75 cm).…”

A new neutron monitor with silver activation

“…The response of the monitor has been measured using PTB calibration fields. These were a 252 Cf (bare) radionuclide source (Kluge, 1998), the quasi mono-energetic neutron reference fields at the PTB accelerator (Nolte et al, 2004), in the neutron energy range from 144 keV to 14.8 MeV and a thermal neutron field available at the GKSS in Hamburg, Germany . At the PTB source facility and at the PTB accelerator, the monitor centre was mounted at a distance of 1.7 m from the source and 1.0 m from the target, respectively, thus providing a slightly divergent beam.…”