Neutron and gamma-ray energy reconstruction for characterization of special nuclear material

Shaun D. Clarke, Michael C. Hamel, Angela Di fulvio, Sara A. Pozzi

Research output: Contribution to journalArticlepeer-review


Characterization of special nuclear material may be performed using energy spectroscopy of either the neutron or gamma-ray emissions from the sample. Gamma-ray spectroscopy can be performed relatively easily using high-resolution semiconductors such as high-purity germanium. Neutron spectroscopy, by contrast, is a complex inverse problem. Here, results are presented for 252Cf and PuBe energy spectra unfolded using a single EJ309 organic scintillator; excellent agreement is observed with the reference spectra. Neutron energy spectroscopy is also possible using a two-plane detector array, whereby time-of-flight kinematics can be used. With this system, energy spectra can also be obtained as a function of position. Spatial-dependent energy spectra are presented for neutron and gamma-ray sources that are in excellent agreement with expectations.

Original languageEnglish (US)
Pages (from-to)1354-1357
Number of pages4
JournalNuclear Engineering and Technology
Issue number6
StatePublished - Sep 2017
Externally publishedYes


  • Neutron imaging
  • Neutron spectroscopy
  • Spectrum unfolding

ASJC Scopus subject areas

  • Nuclear Energy and Engineering


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