A linear response with incident neutron energy was observed for both detectors in the energy range studied, with the incident irradiation beam parallel to the anode wire. The 3He counter studied in this work can be used for neutron spectroscopy up to 7 MeV. The centroid of the peak formed by the 4He nuclei recoiling in neutron beam direction, has a linear dependency on neutron energy up to 22 MeV.
For 3He detectors the resolution for the thermal epithermal neutron peak deteriorates at large high voltage settings, a behavior attributable to the effect of self-induced space charge. At neutron energies up to 7 MeV the resolution of 3He counter was in the range of 4–11% for the full-energy peak. The resolution for 4He recoil peaks in the 4He counter varied from 52% to 22% for the neutron energy in the range of 4–22 MeV.