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A fast-neutron spectrometer for reactor environments

1967; Elsevier BV; Volume: 46; Issue: 2 Linguagem: Inglês

10.1016/0029-554x(67)90089-4

1878-3759

V.V. Verbinski, M S Bokhari,

Radiation Detection and Scintillator Technologies

Abstract A fast-neutron spectrometer which can operate in a reactor environment has been tested in the water shield of the Bulk Shielding Reactor I in gamma-ray fluxes as high as 10 6 R/h. Basically, the spectrometer consists of a very thin layer of 6 LiF between, but not in contact with, two silicon-gold diodes. Neutrons traversing the spectrometer collimator strike the 6 Li foil, and the alpha particle and triton emitted in the resulting 6 Li(n,α)T reaction ( Q = 4.78 MeV) are detected in coincidence in the two diodes. Shadow shielding in the collimator protects the diodes from direct reactor radiations. Background measurements are made by substituting a 7 LiF foil for the sensitive 6 LiF element. The measured spectra are in good agreement with calculated spectra, the measurements and calculations having been normalized to the same absolute neutron source intensity.