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Neutron spectroscopy with TENIS using an artificial neural network.

S Bagherzadeh-Atashchi1, N Ghal-Eh1, F Rahmani2

  • 1Department of Physics, Faculty of Science, Ferdowsi University of Mashhad, P.O. Box 91775-1436, Mashhad, Iran.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|September 23, 2023
PubMed
Summary

A novel ThErmal Neutron Imaging System (TENIS) was adapted for neutron energy spectrum unfolding. This system accurately determines neutron energy spectra, showing less than 10% error for mono-energetic sources.

Keywords:
Artificial neural networkBNCTNeutron spectrum unfoldingPlastic scintillatorTENIS

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Area of Science:

  • Nuclear Physics
  • Neutron Spectroscopy
  • Medical Physics

Background:

  • Boron Neutron Capture Therapy (BNCT) requires precise neutron energy spectrum information.
  • Existing neutron energy spectrum unfolding methods can be complex and time-consuming.
  • Thermal Neutron Imaging Systems (TENIS) are typically used for neutron radiography.

Purpose of the Study:

  • To investigate the potential of a ThErmal Neutron Imaging System (TENIS) for neutron energy spectrum unfolding.
  • To adapt TENIS, originally designed for BNCT applications, into a functional neutron spectrometer.
  • To validate the performance of TENIS in accurately unfolding neutron energy spectra.

Main Methods:

  • Utilized a 70-pixel TENIS, comprising plastic scintillator arrays, to capture thermal neutron images.
  • Generated thermal neutron images from 10^9 incident mono-energetic neutrons.
  • Developed a 70x109 response matrix using MCNPX2.6 code.
  • Employed artificial neural networks in MATLAB for spectrum unfolding.

Main Results:

  • Achieved final result errors below 10% for mono-energetic neutron sources.
  • Obtained a Root Mean Square Error (RMSE) of approximately 0.01 for the unfolded 252Cf neutron spectrum.
  • Demonstrated strong agreement between unfolded spectra from mono-energetic and 252Cf sources.

Conclusions:

  • The TENIS system demonstrates significant potential as a neutron spectrometer.
  • The adapted TENIS system provides accurate neutron energy spectrum unfolding.
  • This novel approach offers a viable alternative for neutron spectroscopy applications.