Spectrometry of 50 and 100Â MeV quasi monochromatic neutron fields with extended range Bonner spheres

This work presents the complete neutron spectrometry, from thermal energies up to the nominal peak energy, of the 50 and 100 MeV QMN fields produced at TSL. This was done by means of two extended range Bonner Sphere Spectrometer (ERBSS) relying on different central detectors and independently calibrated. In spite of its known limitations such as the poor energy resolution, this spectrometer is still the only one capable to simultaneously respond to all energies of interest. Significant outcomes of this work are the neutron spectra and the determination of spectrum-integrated quantities such as the total fluence and the peak fluence.