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Related Experiment Video

Updated: May 13, 2026

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
10:24

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Published on: May 7, 2021

Studies on the detection of concealed objects using the neutron reflection method.

A Papp1

  • 1Institute of Nuclear Research of the Hungarian Academy of Sciences, (ATOMKI), 4001 Debrecen, Pf. 51, Hungary. papppa@atomki.hu

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|February 26, 2013
PubMed
Summary
This summary is machine-generated.

Researchers measured neutron reflection from materials to determine their properties. They found reflection cross sections are additive, allowing for the identification of substances like illicit drugs and explosives.

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Last Updated: May 13, 2026

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Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
11:27

Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2

Published on: December 8, 2016

Area of Science:

  • Nuclear Physics
  • Materials Science

Background:

  • Neutron reflection is a key phenomenon in nuclear reactor design and material analysis.
  • Understanding reflection properties aids in material characterization and detection.

Purpose of the Study:

  • To measure and analytically describe neutron reflection from varying reflector thicknesses.
  • To deduce macroscopic (Σβ) and microscopic (σβ) reflection cross sections for elements and compounds.
  • To investigate the additivity of σβ values for material identification.

Main Methods:

  • Experimental measurement of reflected thermal and 1.45 eV resonance neutrons against reflector thickness.
  • Development of an analytical expression to model neutron reflection.
  • Calculation of macroscopic and microscopic reflection cross sections.

Main Results:

  • An analytical expression was derived to describe neutron reflection as a function of reflector thickness.
  • Macroscopic (Σβ) and microscopic (σβ) reflection cross sections were determined for various substances.
  • The additivity of σβ values was confirmed, even for bulk samples.

Conclusions:

  • The derived analytical expression accurately models neutron reflection.
  • The additivity of microscopic reflection cross sections (σβ) enables the calculation of molecular cross sections (σβmol).
  • This method shows potential for identifying illicit drugs, explosives, and hiding materials based on their neutron reflection properties.