Abstract
The effect of sapphire and bismuth single-crystal filters and their combinations on the quality of neutron radiographic images and neutron tomography data has been studied. The parameters of the contrast of the neutron image were analyzed depending on the monocrystalline filters. Neutron transmission spectra were obtained for sapphire and bismuth single crystals. Additionally, the effect of filters on the overall intensity of the thermal neutron beam and the background of gamma-rays was investigated. Based on the obtained data, we assume that a single-crystal sapphire filter can be most effectively used for radiographic and tomographic installations using thermal neutrons.
Highlights
In recent decades, there has been a growing interest in the development, design, and parameters optimization of neutron radiography and tomography facilities170 Eurasian Journal of Physics and Functional Materials, Vol.5(4).in the world’s neutron centers
We evaluated the effect of additional filters on the contrast parameter, which significantly affects the quality of neutron radiography and tomography images
For the single-crystal sapphire filter, a sharp increase in the neutron transmission curve from 53% to 80% is observed in the range of the neutron wavelengths of 0.8–2 Å
Summary
There has been a growing interest in the development, design, and parameters optimization of neutron radiography and tomography facilities170 Eurasian Journal of Physics and Functional Materials, Vol.5(4).in the world’s neutron centers. We present the results of measurements of an effect of sapphire and bismuth single-crystal filters on the quality of neutron imaging data. For tested materials with a low attenuation coefficient, like aluminum, inserting filters on the beam improves the attenuation coefficients and the contrast parameter, but all changes are at the statistical error level.
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