论文信息 - Fast-neutron spectroscopy with thick organic scintillators

Fast-neutron spectroscopy with thick organic scintillators

Abstract A neutron spectrometer which utilizes a 4.60- by 4.65-cm-dia. NE-213 liquid organic scintillator is described. Pulses due to gamma radiation are eliminated by the use of a modified Forte-type pulse-shape discriminator circuit. The FERDoR unfolding method and code are used to transform the measured pulse-height distribution into a neutron spectrum. This code produces an estimate of the neutron spectrum with a rigorous confidence interval. The effects of nonlinear scintillation characteristics, multiple scattering, and charged-particle reactions are all taken into account. The code is based on constrained minimization and utilizes the known nonnegativity of the neutron spectrum in obtaining the confidence intervals. The scintillator arrangement, the electronic circuit, and the FERDoR code are described. Typical results obtained by unfolding continuous and discrete line spectra are given. Satisfactory overall results were obtained with neutrons from 0.5 to over 16 MeV in a gamma-ray background of ≈ 5 mR/h.

W. R. Burrus | Victor V. Verbinski | V. Verbinski

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