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[en] Changes in the neutron beam spectrum in dependence on thickness of irradiated materials, such as 235U, 239Pu and others characterized by large absorption cross section in the spectrum low-energy part are studied. Absolute sensitivity of the materials neutron radiography method depending on their thickness for neutrons of separate energy groups is evaluated. The conclusion is made that neutron energy, determining the sensitivity, rapidly increases with increase in material thickness, whereas the sensitivity decreases
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