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Imaging Special Nuclear Material using a Handheld Dual Particle Imager.

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A new compact radiation imager using silicon photomultipliers (SiPMs) offers improved detection and localization of special nuclear materials for national security. This system demonstrates effective neutron and gamma-ray imaging capabilities with enhanced resolution and portability.

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Area of Science:

  • Nuclear Engineering
  • Radiation Detection and Imaging
  • National Security Technology

Background:

  • Traditional radiation imaging systems are often large and power-intensive due to the use of photomultiplier tubes (PMTs).
  • A need exists for compact, portable, and low-power radiation imaging systems for various national security applications.

Purpose of the Study:

  • To develop and evaluate a compact dual-particle radiation imaging system prototype.
  • To demonstrate the system's capability in detecting, localizing, and characterizing special nuclear materials.

Main Methods:

  • Utilized silicon photomultipliers (SiPMs) instead of PMTs for reduced size and power consumption.
  • Integrated eight stilbene organic scintillators into a compact imaging system (5.74 × 5.74 × 7.11 cm³).
  • Conducted measurements using Californium-252, plutonium, and neptunium sources to assess performance.

Main Results:

  • Achieved neutron spectroscopic capabilities and characterized neutron image resolution (azimuthal: 9.65 ± 0.94°, altitude: 22.59 ± 5.81°).
  • Demonstrated gamma-ray imaging using organic scintillators.
  • Successfully imaged multiple sources within the same field of view.

Conclusions:

  • The prototype system, leveraging SiPMs and stilbene scintillators, offers a compact and effective solution for radiation imaging.
  • The demonstrated capabilities support applications in nuclear material inspection, emergency response, and warfighter support.