NCT-WES (Neutron Capture Therapy Wide Energy Spectrometer) is a recently developed single-moderator neutron spectrometer with sharply directional response. Compared to the traditional Bonner spheres, NCT-WES can determine the whole spectrum in a single exposure and is nearly insensitive to room scatter. These characteristics make it a convenient transfer instrument for neutron metrology. To validate its use in this field, a measurement campaign was organised at the ASNR Cadarache CEZANE facility. Here the spectra from radionuclide-based reference neutron fields of bare 252Cf, 252Cf moderated in heavy water, and 241Am-Be were studied. Whilst the spectra of the bare and moderated 252Cf resulted to agree with the ISO tabulation, that of the 241Am-Be present a larger proportion of low-energy neutrons compared to both “small” and “large” ISO spectral categories.
Neutron spectrometry in radionuclide-based reference neutron fields at the ASNR Cadarache CEZANE facility using the NCT-WES single-moderator directional spectrometer
Pietropaolo A.;
2025-01-01
Abstract
NCT-WES (Neutron Capture Therapy Wide Energy Spectrometer) is a recently developed single-moderator neutron spectrometer with sharply directional response. Compared to the traditional Bonner spheres, NCT-WES can determine the whole spectrum in a single exposure and is nearly insensitive to room scatter. These characteristics make it a convenient transfer instrument for neutron metrology. To validate its use in this field, a measurement campaign was organised at the ASNR Cadarache CEZANE facility. Here the spectra from radionuclide-based reference neutron fields of bare 252Cf, 252Cf moderated in heavy water, and 241Am-Be were studied. Whilst the spectra of the bare and moderated 252Cf resulted to agree with the ISO tabulation, that of the 241Am-Be present a larger proportion of low-energy neutrons compared to both “small” and “large” ISO spectral categories.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
