Abstract
Abstract The energy resolution of a 3He ionization chamber, which varies from 13 keV FWHM at 0 keV to approximately 30 keV at 1 MeV, allows observation of false peaks due to the presence of scattering or absorbing materials and due to accidental near-coincidences of the rather long-risetime detector pulses. Pulse-risetime distributions depend on the neutron beam's angle of incidence to the detector axis: ability to separate 3He-recoil pulses from full-energy 3He(n.p) pulses diminishes for neutrons of energy greater than 1.5 MeV and incident normal to the detector axis. When high-energy neutrons are present, measurement at a grazing angle is recommended.
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