Study on the unfolding algorithm for D-T neutron energy spectra measurement using recoil proton method

摘要

A proton recoil method for measuring D-T neutron energy spectra usingpolyethylene film and Si (Au) surface barrier detector was presented. Aniteration algorithm for unfolding the recoil proton energy spectrum to theneutron energy spectrum was investigated. The response matrixes R ofpolyethylene film at 0 degree and 45 degree were obtained by simulating therecoil proton energy spectra from the mono-energetic neutron using MCNP code.Under an assumed D-T neutron spectrum, the recoil proton spectra frompolyethylene film at 0 degree and 45 degree were also simulated using MCNPcode. Based on the response matrixes R and the simulated recoil proton spectraat 0 degree and 45 degree, the unfolded neutron spectra were respectivelyobtained using the iteration algorithm, and compared with the assumed neutronspectrum. The results show that the iteration algorithm method can be appliedto unfold the recoil proton energy spectrum to the neutron energy spectrum forD-T neutron energy spectra measurement using recoil proton method.