Abstract

The increment of reflected thermal and 1.45eV resonance neutrons vs. the thickness of the reflector has been measured and described by an analytical expression. Macroscopic, Σβ, and microscopic, σβ, reflection cross sections averaged over the bulk reflector substances were deduced for some elements and compounds. It was found that the σβ values are additive even for bulk samples and so the σβmol could be given for some illicit drugs, explosives and hiding materials.

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