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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Detecting and characterizing special nuclear material for nuclear nonproliferation applications.

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New instruments and techniques were tested for detecting and characterizing special nuclear material (SNM), including plutonium and highly enriched uranium. Experiments demonstrated successful SNM detection and imaging using prototype systems and advanced analysis methods.

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Area of Science:

  • Nuclear Engineering
  • Nuclear Security
  • Applied Physics

Background:

  • There is a critical need for advanced instrumentation and techniques for the detection and characterization of special nuclear material (SNM), such as highly enriched uranium and plutonium.
  • Developing and validating these technologies requires experimental data from SNM itself, which is often scarce and highly controlled.

Purpose of the Study:

  • To evaluate novel instruments and methodologies for detecting, characterizing, and localizing SNM.
  • To demonstrate the efficacy of prototype detection systems using unclassified, kilogram-quantity SNM objects.

Main Methods:

  • Experiments were conducted at the National Criticality Experiments Research Center using prototype detectors and techniques.
  • Passive detection and imaging of plutonium and uranium were performed using gamma-ray and dual particle (fast neutron and gamma-ray) imaging.
  • Active interrogation of uranium was analyzed through delayed neutron emissions using a neutron generator.

Main Results:

  • Successful detection and characterization of SNM samples with masses ranging from 3.3 to 13.8 kg were achieved.
  • New results in passive imaging of plutonium and uranium objects were presented.
  • A novel analysis of delayed neutron emissions during active interrogation of uranium was demonstrated.

Conclusions:

  • The developed prototype detection systems show promise for SNM detection and characterization.
  • The experimental findings support the advancement of technologies for nuclear material monitoring and verification.
  • Further research and development are warranted to enhance SNM detection capabilities.