A method of neutron-energy evaluation based on the position distribution of recoil protons

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A method of neutron-energy evaluation, which was recently proposed by the author’s group, has been applied to the investigation of an 241Am-Be source in order to confirm the validity of this novel approach; the method is based on the position distribution measurement of recoil protons by an imaging plate (IP) combined with a cone-like converter. The observed position distribution of recoil protons apparently involved neutron-energy information. An unfolding of the position distribution was plainly attempted with the response functions calculated by a simplified Monte Carlo method; the evaluated neutron spectra indicated the energy characteristics of an 241Am-Be source. When a full Monte Carlo Code, PHITS, was used to calculate the position distributions of recoil protons in order to obtain more correct response functions, the result of neutron-spectra evaluation has been much improved. The evaluation of neutron-energy spectrum by the present method will be further improved by the more accurate calculation of response functions with taking account of the complicated response of IP to low energy protons carefully, as well as by the application of more reliable unfolding algorithms and more appropriate position sensitive detectors.

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