Abstract
In this work an attempt is made to measure and analyze fast neutron spectrum from Am–Be source. This method depends on the determination of the energy and the scattering angle of the induced proton due to the fast neutron interaction with the hydrogen atoms in CR-39 track detectors. The neutron irradiation is performed using a 5 mCi Am–Be source on a highly polished edge of CR-39 track detector. The length of proton track profile is determined from the surface of CR-39 normal to beam incidence using an automatic image analyzer system at NIS. From the profile length measurements, the range and the energy of the protons are determined using an energy-range relationship and consequently the neutron energy is calculated. It was found that the calculated neutron energy spectrum of the studied Am–Be source showed three peaks at 3.5, 4.5 and 8.0 MeV. A comparison between the present measurements of neutron spectra by proton profile or track diameter technique with the published neutron spectra measured by other techniques was made and a good agreement was found.
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